includes/WebRequest.php

   1 <?php
   2 /**
   3  * Deal with importing all those nasssty globals and things
   4  *
   5  * Copyright © 2003 Brion Vibber <brion@pobox.com>
   6  * http://www.mediawiki.org/
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  21  * http://www.gnu.org/copyleft/gpl.html
  22  *
  23  * @file
  24  */
  25
  26 /**
  27  * The WebRequest class encapsulates getting at data passed in the
  28  * URL or via a POSTed form, handling remove of "magic quotes" slashes,
  29  * stripping illegal input characters and normalizing Unicode sequences.
  30  *
  31  * Usually this is used via a global singleton, $wgRequest. You should
  32  * not create a second WebRequest object; make a FauxRequest object if
  33  * you want to pass arbitrary data to some function in place of the web
  34  * input.
  35  *
  36  * @ingroup HTTP
  37  */
  38 class WebRequest {
  39         protected $data, $headers = array();
  40
  41         /**
  42          * Lazy-init response object
  43          * @var WebResponse
  44          */
  45         private $response;
  46
  47         /**
  48          * Cached client IP address
  49          * @var String
  50          */
  51         private $ip;
  52
  53         public function __construct() {
  54                 /// @todo FIXME: This preemptive de-quoting can interfere with other web libraries
  55                 ///        and increases our memory footprint. It would be cleaner to do on
  56                 ///        demand; but currently we have no wrapper for $_SERVER etc.
  57                 $this->checkMagicQuotes();
  58
  59                 // POST overrides GET data
  60                 // We don't use $_REQUEST here to avoid interference from cookies...
  61                 $this->data = $_POST + $_GET;
  62         }
  63
  64         /**
  65          * Extract relevant query arguments from the http request uri's path
  66          * to be merged with the normal php provided query arguments.
  67          * Tries to use the REQUEST_URI data if available and parses it
  68          * according to the wiki's configuration looking for any known pattern.
  69          *
  70          * If the REQUEST_URI is not provided we'll fall back on the PATH_INFO
  71          * provided by the server if any and use that to set a 'title' parameter.
  72          *
  73          * @param $want string: If this is not 'all', then the function
  74          * will return an empty array if it determines that the URL is
  75          * inside a rewrite path.
  76          *
  77          * @return Array: Any query arguments found in path matches.
  78          */
  79         static public function getPathInfo( $want = 'all' ) {
  80                 global $wgUsePathInfo;
  81                 // PATH_INFO is mangled due to http://bugs.php.net/bug.php?id=31892
  82                 // And also by Apache 2.x, double slashes are converted to single slashes.
  83                 // So we will use REQUEST_URI if possible.
  84                 $matches = array();
  85                 if ( !empty( $_SERVER['REQUEST_URI'] ) ) {
  86                         // Slurp out the path portion to examine...
  87                         $url = $_SERVER['REQUEST_URI'];
  88                         if ( !preg_match( '!^https?://!', $url ) ) {
  89                                 $url = 'http://unused' . $url;
  90                         }
  91                         wfSuppressWarnings();
  92                         $a = parse_url( $url );
  93                         wfRestoreWarnings();
  94                         if( $a ) {
  95                                 $path = isset( $a['path'] ) ? $a['path'] : '';
  96
  97                                 global $wgScript;
  98                                 if( $path == $wgScript && $want !== 'all' ) {
  99                                         // Script inside a rewrite path?
 100                                         // Abort to keep from breaking...
 101                                         return $matches;
 102                                 }
 103
 104                                 $router = new PathRouter;
 105
 106                                 // Raw PATH_INFO style
 107                                 $router->add( "$wgScript/$1" );
 108
 109                                 if( isset( $_SERVER['SCRIPT_NAME'] )
 110                                         && preg_match( '/\.php5?/', $_SERVER['SCRIPT_NAME'] ) )
 111                                 {
 112                                         # Check for SCRIPT_NAME, we handle index.php explicitly
 113                                         # But we do have some other .php files such as img_auth.php
 114                                         # Don't let root article paths clober the parsing for them
 115                                         $router->add( $_SERVER['SCRIPT_NAME'] . "/$1" );
 116                                 }
 117
 118                                 global $wgArticlePath;
 119                                 if( $wgArticlePath ) {
 120                                         $router->add( $wgArticlePath );
 121                                 }
 122
 123                                 global $wgActionPaths;
 124                                 if( $wgActionPaths ) {
 125                                         $router->add( $wgActionPaths, array( 'action' => '$key' ) );
 126                                 }
 127
 128                                 global $wgVariantArticlePath, $wgContLang;
 129                                 if( $wgVariantArticlePath ) {
 130                                         $router->add( $wgVariantArticlePath,
 131                                                 array( 'variant' => '$2'),
 132                                                 array( '$2' => $wgContLang->getVariants() )
 133                                         );
 134                                 }
 135
 136                                 wfRunHooks( 'WebRequestPathInfoRouter', array( $router ) );
 137
 138                                 $matches = $router->parse( $path );
 139                         }
 140                 } elseif ( $wgUsePathInfo ) {
 141                         if ( isset( $_SERVER['ORIG_PATH_INFO'] ) && $_SERVER['ORIG_PATH_INFO'] != '' ) {
 142                                 // Mangled PATH_INFO
 143                                 // http://bugs.php.net/bug.php?id=31892
 144                                 // Also reported when ini_get('cgi.fix_pathinfo')==false
 145                                 $matches['title'] = substr( $_SERVER['ORIG_PATH_INFO'], 1 );
 146
 147                         } elseif ( isset( $_SERVER['PATH_INFO'] ) && ($_SERVER['PATH_INFO'] != '') ) {
 148                                 // Regular old PATH_INFO yay
 149                                 $matches['title'] = substr( $_SERVER['PATH_INFO'], 1 );
 150                         }
 151                 }
 152
 153                 return $matches;
 154         }
 155
 156         /**
 157          * Work out an appropriate URL prefix containing scheme and host, based on
 158          * information detected from $_SERVER
 159          *
 160          * @return string
 161          */
 162         public static function detectServer() {
 163                 list( $proto, $stdPort ) = self::detectProtocolAndStdPort();
 164
 165                 $varNames = array( 'HTTP_HOST', 'SERVER_NAME', 'HOSTNAME', 'SERVER_ADDR' );
 166                 $host = 'localhost';
 167                 $port = $stdPort;
 168                 foreach ( $varNames as $varName ) {
 169                         if ( !isset( $_SERVER[$varName] ) ) {
 170                                 continue;
 171                         }
 172                         $parts = IP::splitHostAndPort( $_SERVER[$varName] );
 173                         if ( !$parts ) {
 174                                 // Invalid, do not use
 175                                 continue;
 176                         }
 177                         $host = $parts[0];
 178                         if ( $parts[1] === false ) {
 179                                 if ( isset( $_SERVER['SERVER_PORT'] ) ) {
 180                                         $port = $_SERVER['SERVER_PORT'];
 181                                 } // else leave it as $stdPort
 182                         } else {
 183                                 $port = $parts[1];
 184                         }
 185                         break;
 186                 }
 187
 188                 return $proto . '://' . IP::combineHostAndPort( $host, $port, $stdPort );
 189         }
 190
 191         /**
 192          * @return array
 193          */
 194         public static function detectProtocolAndStdPort() {
 195                 return ( isset( $_SERVER['HTTPS'] ) && $_SERVER['HTTPS'] == 'on' ) ? array( 'https', 443 ) : array( 'http', 80 );
 196         }
 197
 198         /**
 199          * @return string
 200          */
 201         public static function detectProtocol() {
 202                 list( $proto, $stdPort ) = self::detectProtocolAndStdPort();
 203                 return $proto;
 204         }
 205
 206         /**
 207          * Check for title, action, and/or variant data in the URL
 208          * and interpolate it into the GET variables.
 209          * This should only be run after $wgContLang is available,
 210          * as we may need the list of language variants to determine
 211          * available variant URLs.
 212          */
 213         public function interpolateTitle() {
 214                 // bug 16019: title interpolation on API queries is useless and sometimes harmful
 215                 if ( defined( 'MW_API' ) ) {
 216                         return;
 217                 }
 218
 219                 $matches = self::getPathInfo( 'title' );
 220                 foreach( $matches as $key => $val) {
 221                         $this->data[$key] = $_GET[$key] = $_REQUEST[$key] = $val;
 222                 }
 223         }
 224
 225         /**
 226          * URL rewriting function; tries to extract page title and,
 227          * optionally, one other fixed parameter value from a URL path.
 228          *
 229          * @param $path string: the URL path given from the client
 230          * @param $bases array: one or more URLs, optionally with $1 at the end
 231          * @param $key string: if provided, the matching key in $bases will be
 232          *             passed on as the value of this URL parameter
 233          * @return array of URL variables to interpolate; empty if no match
 234          */
 235         static function extractTitle( $path, $bases, $key = false ) {
 236                 foreach( (array)$bases as $keyValue => $base ) {
 237                         // Find the part after $wgArticlePath
 238                         $base = str_replace( '$1', '', $base );
 239                         $baseLen = strlen( $base );
 240                         if( substr( $path, 0, $baseLen ) == $base ) {
 241                                 $raw = substr( $path, $baseLen );
 242                                 if( $raw !== '' ) {
 243                                         $matches = array( 'title' => rawurldecode( $raw ) );
 244                                         if( $key ) {
 245                                                 $matches[$key] = $keyValue;
 246                                         }
 247                                         return $matches;
 248                                 }
 249                         }
 250                 }
 251                 return array();
 252         }
 253
 254         /**
 255          * Recursively strips slashes from the given array;
 256          * used for undoing the evil that is magic_quotes_gpc.
 257          *
 258          * @param $arr array: will be modified
 259          * @param $topLevel bool Specifies if the array passed is from the top
 260          * level of the source. In PHP5 magic_quotes only escapes the first level
 261          * of keys that belong to an array.
 262          * @return array the original array
 263          * @see http://www.php.net/manual/en/function.get-magic-quotes-gpc.php#49612
 264          */
 265         private function &fix_magic_quotes( &$arr, $topLevel = true ) {
 266                 $clean = array();
 267                 foreach( $arr as $key => $val ) {
 268                         if( is_array( $val ) ) {
 269                                 $cleanKey = $topLevel ? stripslashes( $key ) : $key;
 270                                 $clean[$cleanKey] = $this->fix_magic_quotes( $arr[$key], false );
 271                         } else {
 272                                 $cleanKey = stripslashes( $key );
 273                                 $clean[$cleanKey] = stripslashes( $val );
 274                         }
 275                 }
 276                 $arr = $clean;
 277                 return $arr;
 278         }
 279
 280         /**
 281          * If magic_quotes_gpc option is on, run the global arrays
 282          * through fix_magic_quotes to strip out the stupid slashes.
 283          * WARNING: This should only be done once! Running a second
 284          * time could damage the values.
 285          */
 286         private function checkMagicQuotes() {
 287                 $mustFixQuotes = function_exists( 'get_magic_quotes_gpc' )
 288                         && get_magic_quotes_gpc();
 289                 if( $mustFixQuotes ) {
 290                         $this->fix_magic_quotes( $_COOKIE );
 291                         $this->fix_magic_quotes( $_ENV );
 292                         $this->fix_magic_quotes( $_GET );
 293                         $this->fix_magic_quotes( $_POST );
 294                         $this->fix_magic_quotes( $_REQUEST );
 295                         $this->fix_magic_quotes( $_SERVER );
 296                 }
 297         }
 298
 299         /**
 300          * Recursively normalizes UTF-8 strings in the given array.
 301          *
 302          * @param $data string|array
 303          * @return array|string cleaned-up version of the given
 304          * @private
 305          */
 306         function normalizeUnicode( $data ) {
 307                 if( is_array( $data ) ) {
 308                         foreach( $data as $key => $val ) {
 309                                 $data[$key] = $this->normalizeUnicode( $val );
 310                         }
 311                 } else {
 312                         global $wgContLang;
 313                         $data = isset( $wgContLang ) ? $wgContLang->normalize( $data ) : UtfNormal::cleanUp( $data );
 314                 }
 315                 return $data;
 316         }
 317
 318         /**
 319          * Fetch a value from the given array or return $default if it's not set.
 320          *
 321          * @param $arr Array
 322          * @param $name String
 323          * @param $default Mixed
 324          * @return mixed
 325          */
 326         private function getGPCVal( $arr, $name, $default ) {
 327                 # PHP is so nice to not touch input data, except sometimes:
 328                 # http://us2.php.net/variables.external#language.variables.external.dot-in-names
 329                 # Work around PHP *feature* to avoid *bugs* elsewhere.
 330                 $name = strtr( $name, '.', '_' );
 331                 if( isset( $arr[$name] ) ) {
 332                         global $wgContLang;
 333                         $data = $arr[$name];
 334                         if( isset( $_GET[$name] ) && !is_array( $data ) ) {
 335                                 # Check for alternate/legacy character encoding.
 336                                 if( isset( $wgContLang ) ) {
 337                                         $data = $wgContLang->checkTitleEncoding( $data );
 338                                 }
 339                         }
 340                         $data = $this->normalizeUnicode( $data );
 341                         return $data;
 342                 } else {
 343                         taint( $default );
 344                         return $default;
 345                 }
 346         }
 347
 348         /**
 349          * Fetch a scalar from the input or return $default if it's not set.
 350          * Returns a string. Arrays are discarded. Useful for
 351          * non-freeform text inputs (e.g. predefined internal text keys
 352          * selected by a drop-down menu). For freeform input, see getText().
 353          *
 354          * @param $name String
 355          * @param $default String: optional default (or NULL)
 356          * @return String
 357          */
 358         public function getVal( $name, $default = null ) {
 359                 $val = $this->getGPCVal( $this->data, $name, $default );
 360                 if( is_array( $val ) ) {
 361                         $val = $default;
 362                 }
 363                 if( is_null( $val ) ) {
 364                         return $val;
 365                 } else {
 366                         return (string)$val;
 367                 }
 368         }
 369
 370         /**
 371          * Set an arbitrary value into our get/post data.
 372          *
 373          * @param $key String: key name to use
 374          * @param $value Mixed: value to set
 375          * @return Mixed: old value if one was present, null otherwise
 376          */
 377         public function setVal( $key, $value ) {
 378                 $ret = isset( $this->data[$key] ) ? $this->data[$key] : null;
 379                 $this->data[$key] = $value;
 380                 return $ret;
 381         }
 382
 383
 384         /**
 385          * Unset an arbitrary value from our get/post data.
 386          *
 387          * @param $key String: key name to use
 388          * @return Mixed: old value if one was present, null otherwise
 389          */
 390         public function unsetVal( $key ) {
 391                 if ( !isset( $this->data[$key] ) ) {
 392                         $ret = null;
 393                 } else {
 394                         $ret = $this->data[$key];
 395                         unset( $this->data[$key] );
 396                 }
 397                 return $ret;
 398         }
 399
 400         /**
 401          * Fetch an array from the input or return $default if it's not set.
 402          * If source was scalar, will return an array with a single element.
 403          * If no source and no default, returns NULL.
 404          *
 405          * @param $name String
 406          * @param $default Array: optional default (or NULL)
 407          * @return Array
 408          */
 409         public function getArray( $name, $default = null ) {
 410                 $val = $this->getGPCVal( $this->data, $name, $default );
 411                 if( is_null( $val ) ) {
 412                         return null;
 413                 } else {
 414                         return (array)$val;
 415                 }
 416         }
 417
 418         /**
 419          * Fetch an array of integers, or return $default if it's not set.
 420          * If source was scalar, will return an array with a single element.
 421          * If no source and no default, returns NULL.
 422          * If an array is returned, contents are guaranteed to be integers.
 423          *
 424          * @param $name String
 425          * @param $default Array: option default (or NULL)
 426          * @return Array of ints
 427          */
 428         public function getIntArray( $name, $default = null ) {
 429                 $val = $this->getArray( $name, $default );
 430                 if( is_array( $val ) ) {
 431                         $val = array_map( 'intval', $val );
 432                 }
 433                 return $val;
 434         }
 435
 436         /**
 437          * Fetch an integer value from the input or return $default if not set.
 438          * Guaranteed to return an integer; non-numeric input will typically
 439          * return 0.
 440          *
 441          * @param $name String
 442          * @param $default Integer
 443          * @return Integer
 444          */
 445         public function getInt( $name, $default = 0 ) {
 446                 return intval( $this->getVal( $name, $default ) );
 447         }
 448
 449         /**
 450          * Fetch an integer value from the input or return null if empty.
 451          * Guaranteed to return an integer or null; non-numeric input will
 452          * typically return null.
 453          *
 454          * @param $name String
 455          * @return Integer
 456          */
 457         public function getIntOrNull( $name ) {
 458                 $val = $this->getVal( $name );
 459                 return is_numeric( $val )
 460                         ? intval( $val )
 461                         : null;
 462         }
 463
 464         /**
 465          * Fetch a boolean value from the input or return $default if not set.
 466          * Guaranteed to return true or false, with normal PHP semantics for
 467          * boolean interpretation of strings.
 468          *
 469          * @param $name String
 470          * @param $default Boolean
 471          * @return Boolean
 472          */
 473         public function getBool( $name, $default = false ) {
 474                 return (bool)$this->getVal( $name, $default );
 475         }
 476
 477         /**
 478          * Fetch a boolean value from the input or return $default if not set.
 479          * Unlike getBool, the string "false" will result in boolean false, which is
 480          * useful when interpreting information sent from JavaScript.
 481          *
 482          * @param $name String
 483          * @param $default Boolean
 484          * @return Boolean
 485          */
 486         public function getFuzzyBool( $name, $default = false ) {
 487                 return $this->getBool( $name, $default ) && strcasecmp( $this->getVal( $name ), 'false' ) !== 0;
 488         }
 489
 490         /**
 491          * Return true if the named value is set in the input, whatever that
 492          * value is (even "0"). Return false if the named value is not set.
 493          * Example use is checking for the presence of check boxes in forms.
 494          *
 495          * @param $name String
 496          * @return Boolean
 497          */
 498         public function getCheck( $name ) {
 499                 # Checkboxes and buttons are only present when clicked
 500                 # Presence connotes truth, abscense false
 501                 return $this->getVal( $name, null ) !== null;
 502         }
 503
 504         /**
 505          * Fetch a text string from the given array or return $default if it's not
 506          * set. Carriage returns are stripped from the text, and with some language
 507          * modules there is an input transliteration applied. This should generally
 508          * be used for form "<textarea>" and "<input>" fields. Used for
 509          * user-supplied freeform text input (for which input transformations may
 510          * be required - e.g.  Esperanto x-coding).
 511          *
 512          * @param $name String
 513          * @param $default String: optional
 514          * @return String
 515          */
 516         public function getText( $name, $default = '' ) {
 517                 global $wgContLang;
 518                 $val = $this->getVal( $name, $default );
 519                 return str_replace( "\r\n", "\n",
 520                         $wgContLang->recodeInput( $val ) );
 521         }
 522
 523         /**
 524          * Extracts the given named values into an array.
 525          * If no arguments are given, returns all input values.
 526          * No transformation is performed on the values.
 527          *
 528          * @return array
 529          */
 530         public function getValues() {
 531                 $names = func_get_args();
 532                 if ( count( $names ) == 0 ) {
 533                         $names = array_keys( $this->data );
 534                 }
 535
 536                 $retVal = array();
 537                 foreach ( $names as $name ) {
 538                         $value = $this->getGPCVal( $this->data, $name, null );
 539                         if ( !is_null( $value ) ) {
 540                                 $retVal[$name] = $value;
 541                         }
 542                 }
 543                 return $retVal;
 544         }
 545
 546         /**
 547          * Returns the names of all input values excluding those in $exclude.
 548          *
 549          * @param $exclude Array
 550          * @return array
 551          */
 552         public function getValueNames( $exclude = array() ) {
 553                 return array_diff( array_keys( $this->getValues() ), $exclude );
 554         }
 555
 556         /**
 557          * Get the values passed in the query string.
 558          * No transformation is performed on the values.
 559          *
 560          * @return Array
 561          */
 562          public function getQueryValues() {
 563                 return $_GET;
 564          }
 565
 566         /**
 567          * Get the HTTP method used for this request.
 568          *
 569          * @return String
 570          */
 571         public function getMethod() {
 572                 return isset( $_SERVER['REQUEST_METHOD'] ) ? $_SERVER['REQUEST_METHOD'] : 'GET';
 573         }
 574
 575         /**
 576          * Returns true if the present request was reached by a POST operation,
 577          * false otherwise (GET, HEAD, or command-line).
 578          *
 579          * Note that values retrieved by the object may come from the
 580          * GET URL etc even on a POST request.
 581          *
 582          * @return Boolean
 583          */
 584         public function wasPosted() {
 585                 return $this->getMethod() == 'POST';
 586         }
 587
 588         /**
 589          * Returns true if there is a session cookie set.
 590          * This does not necessarily mean that the user is logged in!
 591          *
 592          * If you want to check for an open session, use session_id()
 593          * instead; that will also tell you if the session was opened
 594          * during the current request (in which case the cookie will
 595          * be sent back to the client at the end of the script run).
 596          *
 597          * @return Boolean
 598          */
 599         public function checkSessionCookie() {
 600                 return isset( $_COOKIE[ session_name() ] );
 601         }
 602
 603         /**
 604          * Get a cookie from the $_COOKIE jar
 605          *
 606          * @param $key String: the name of the cookie
 607          * @param $prefix String: a prefix to use for the cookie name, if not $wgCookiePrefix
 608          * @param $default Mixed: what to return if the value isn't found
 609          * @return Mixed: cookie value or $default if the cookie not set
 610          */
 611         public function getCookie( $key, $prefix = null, $default = null ) {
 612                 if( $prefix === null ) {
 613                         global $wgCookiePrefix;
 614                         $prefix = $wgCookiePrefix;
 615                 }
 616                 return $this->getGPCVal( $_COOKIE, $prefix . $key , $default );
 617         }
 618
 619         /**
 620          * Return the path and query string portion of the request URI.
 621          * This will be suitable for use as a relative link in HTML output.
 622          *
 623          * @throws MWException
 624          * @return String
 625          */
 626         public function getRequestURL() {
 627                 if( isset( $_SERVER['REQUEST_URI'] ) && strlen( $_SERVER['REQUEST_URI'] ) ) {
 628                         $base = $_SERVER['REQUEST_URI'];
 629                 } elseif ( isset( $_SERVER['HTTP_X_ORIGINAL_URL'] ) && strlen( $_SERVER['HTTP_X_ORIGINAL_URL'] ) ) {
 630                         // Probably IIS; doesn't set REQUEST_URI
 631                         $base = $_SERVER['HTTP_X_ORIGINAL_URL'];
 632                 } elseif( isset( $_SERVER['SCRIPT_NAME'] ) ) {
 633                         $base = $_SERVER['SCRIPT_NAME'];
 634                         if( isset( $_SERVER['QUERY_STRING'] ) && $_SERVER['QUERY_STRING'] != '' ) {
 635                                 $base .= '?' . $_SERVER['QUERY_STRING'];
 636                         }
 637                 } else {
 638                         // This shouldn't happen!
 639                         throw new MWException( "Web server doesn't provide either " .
 640                                 "REQUEST_URI, HTTP_X_ORIGINAL_URL or SCRIPT_NAME. Report details " .
 641                                 "of your web server configuration to http://bugzilla.wikimedia.org/" );
 642                 }
 643                 // User-agents should not send a fragment with the URI, but
 644                 // if they do, and the web server passes it on to us, we
 645                 // need to strip it or we get false-positive redirect loops
 646                 // or weird output URLs
 647                 $hash = strpos( $base, '#' );
 648                 if( $hash !== false ) {
 649                         $base = substr( $base, 0, $hash );
 650                 }
 651                 if( $base[0] == '/' ) {
 652                         return $base;
 653                 } else {
 654                         // We may get paths with a host prepended; strip it.
 655                         return preg_replace( '!^[^:]+://[^/]+/!', '/', $base );
 656                 }
 657         }
 658
 659         /**
 660          * Return the request URI with the canonical service and hostname, path,
 661          * and query string. This will be suitable for use as an absolute link
 662          * in HTML or other output.
 663          *
 664          * If $wgServer is protocol-relative, this will return a fully
 665          * qualified URL with the protocol that was used for this request.
 666          *
 667          * @return String
 668          */
 669         public function getFullRequestURL() {
 670                 return wfExpandUrl( $this->getRequestURL(), PROTO_CURRENT );
 671         }
 672
 673         /**
 674          * Take an arbitrary query and rewrite the present URL to include it
 675          * @param $query String: query string fragment; do not include initial '?'
 676          *
 677          * @return String
 678          */
 679         public function appendQuery( $query ) {
 680                 return $this->appendQueryArray( wfCgiToArray( $query ) );
 681         }
 682
 683         /**
 684          * HTML-safe version of appendQuery().
 685          * @deprecated: Deprecated in 1.20, warnings in 1.21, remove in 1.22.
 686          *
 687          * @param $query String: query string fragment; do not include initial '?'
 688          * @return String
 689          */
 690         public function escapeAppendQuery( $query ) {
 691                 return htmlspecialchars( $this->appendQuery( $query ) );
 692         }
 693
 694         /**
 695          * @param $key
 696          * @param $value
 697          * @param $onlyquery bool
 698          * @return String
 699          */
 700         public function appendQueryValue( $key, $value, $onlyquery = false ) {
 701                 return $this->appendQueryArray( array( $key => $value ), $onlyquery );
 702         }
 703
 704         /**
 705          * Appends or replaces value of query variables.
 706          *
 707          * @param $array Array of values to replace/add to query
 708          * @param $onlyquery Bool: whether to only return the query string and not
 709          *                   the complete URL
 710          * @return String
 711          */
 712         public function appendQueryArray( $array, $onlyquery = false ) {
 713                 global $wgTitle;
 714                 $newquery = $this->getQueryValues();
 715                 unset( $newquery['title'] );
 716                 $newquery = array_merge( $newquery, $array );
 717                 $query = wfArrayToCGI( $newquery );
 718                 return $onlyquery ? $query : $wgTitle->getLocalURL( $query );
 719         }
 720
 721         /**
 722          * Check for limit and offset parameters on the input, and return sensible
 723          * defaults if not given. The limit must be positive and is capped at 5000.
 724          * Offset must be positive but is not capped.
 725          *
 726          * @param $deflimit Integer: limit to use if no input and the user hasn't set the option.
 727          * @param $optionname String: to specify an option other than rclimit to pull from.
 728          * @return array first element is limit, second is offset
 729          */
 730         public function getLimitOffset( $deflimit = 50, $optionname = 'rclimit' ) {
 731                 global $wgUser;
 732
 733                 $limit = $this->getInt( 'limit', 0 );
 734                 if( $limit < 0 ) {
 735                         $limit = 0;
 736                 }
 737                 if( ( $limit == 0 ) && ( $optionname != '' ) ) {
 738                         $limit = (int)$wgUser->getOption( $optionname );
 739                 }
 740                 if( $limit <= 0 ) {
 741                         $limit = $deflimit;
 742                 }
 743                 if( $limit > 5000 ) {
 744                         $limit = 5000; # We have *some* limits...
 745                 }
 746
 747                 $offset = $this->getInt( 'offset', 0 );
 748                 if( $offset < 0 ) {
 749                         $offset = 0;
 750                 }
 751
 752                 return array( $limit, $offset );
 753         }
 754
 755         /**
 756          * Return the path to the temporary file where PHP has stored the upload.
 757          *
 758          * @param $key String:
 759          * @return string or NULL if no such file.
 760          */
 761         public function getFileTempname( $key ) {
 762                 $file = new WebRequestUpload( $this, $key );
 763                 return $file->getTempName();
 764         }
 765
 766         /**
 767          * Return the size of the upload, or 0.
 768          *
 769          * @deprecated since 1.17
 770          * @param $key String:
 771          * @return integer
 772          */
 773         public function getFileSize( $key ) {
 774                 wfDeprecated( __METHOD__, '1.17' );
 775                 $file = new WebRequestUpload( $this, $key );
 776                 return $file->getSize();
 777         }
 778
 779         /**
 780          * Return the upload error or 0
 781          *
 782          * @param $key String:
 783          * @return integer
 784          */
 785         public function getUploadError( $key ) {
 786                 $file = new WebRequestUpload( $this, $key );
 787                 return $file->getError();
 788         }
 789
 790         /**
 791          * Return the original filename of the uploaded file, as reported by
 792          * the submitting user agent. HTML-style character entities are
 793          * interpreted and normalized to Unicode normalization form C, in part
 794          * to deal with weird input from Safari with non-ASCII filenames.
 795          *
 796          * Other than this the name is not verified for being a safe filename.
 797          *
 798          * @param $key String:
 799          * @return string or NULL if no such file.
 800          */
 801         public function getFileName( $key ) {
 802                 $file = new WebRequestUpload( $this, $key );
 803                 return $file->getName();
 804         }
 805
 806         /**
 807          * Return a WebRequestUpload object corresponding to the key
 808          *
 809          * @param $key string
 810          * @return WebRequestUpload
 811          */
 812         public function getUpload( $key ) {
 813                 return new WebRequestUpload( $this, $key );
 814         }
 815
 816         /**
 817          * Return a handle to WebResponse style object, for setting cookies,
 818          * headers and other stuff, for Request being worked on.
 819          *
 820          * @return WebResponse
 821          */
 822         public function response() {
 823                 /* Lazy initialization of response object for this request */
 824                 if ( !is_object( $this->response ) ) {
 825                         $class = ( $this instanceof FauxRequest ) ? 'FauxResponse' : 'WebResponse';
 826                         $this->response = new $class();
 827                 }
 828                 return $this->response;
 829         }
 830
 831         /**
 832          * Initialise the header list
 833          */
 834         private function initHeaders() {
 835                 if ( count( $this->headers ) ) {
 836                         return;
 837                 }
 838
 839                 if ( function_exists( 'apache_request_headers' ) ) {
 840                         foreach ( apache_request_headers() as $tempName => $tempValue ) {
 841                                 $this->headers[ strtoupper( $tempName ) ] = $tempValue;
 842                         }
 843                 } else {
 844                         foreach ( $_SERVER as $name => $value ) {
 845                                 if ( substr( $name, 0, 5 ) === 'HTTP_' ) {
 846                                         $name = str_replace( '_', '-',  substr( $name, 5 ) );
 847                                         $this->headers[$name] = $value;
 848                                 } elseif ( $name === 'CONTENT_LENGTH' ) {
 849                                         $this->headers['CONTENT-LENGTH'] = $value;
 850                                 }
 851                         }
 852                 }
 853         }
 854
 855         /**
 856          * Get an array containing all request headers
 857          *
 858          * @return Array mapping header name to its value
 859          */
 860         public function getAllHeaders() {
 861                 $this->initHeaders();
 862                 return $this->headers;
 863         }
 864
 865         /**
 866          * Get a request header, or false if it isn't set
 867          * @param $name String: case-insensitive header name
 868          *
 869          * @return string|bool False on failure
 870          */
 871         public function getHeader( $name ) {
 872                 $this->initHeaders();
 873                 $name = strtoupper( $name );
 874                 if ( isset( $this->headers[$name] ) ) {
 875                         return $this->headers[$name];
 876                 } else {
 877                         return false;
 878                 }
 879         }
 880
 881         /**
 882          * Get data from $_SESSION
 883          *
 884          * @param $key String: name of key in $_SESSION
 885          * @return Mixed
 886          */
 887         public function getSessionData( $key ) {
 888                 if( !isset( $_SESSION[$key] ) ) {
 889                         return null;
 890                 }
 891                 return $_SESSION[$key];
 892         }
 893
 894         /**
 895          * Set session data
 896          *
 897          * @param $key String: name of key in $_SESSION
 898          * @param $data Mixed
 899          */
 900         public function setSessionData( $key, $data ) {
 901                 $_SESSION[$key] = $data;
 902         }
 903
 904         /**
 905          * Check if Internet Explorer will detect an incorrect cache extension in
 906          * PATH_INFO or QUERY_STRING. If the request can't be allowed, show an error
 907          * message or redirect to a safer URL. Returns true if the URL is OK, and
 908          * false if an error message has been shown and the request should be aborted.
 909          *
 910          * @param $extWhitelist array
 911          * @throws HttpError
 912          * @return bool
 913          */
 914         public function checkUrlExtension( $extWhitelist = array() ) {
 915                 global $wgScriptExtension;
 916                 $extWhitelist[] = ltrim( $wgScriptExtension, '.' );
 917                 if ( IEUrlExtension::areServerVarsBad( $_SERVER, $extWhitelist ) ) {
 918                         if ( !$this->wasPosted() ) {
 919                                 $newUrl = IEUrlExtension::fixUrlForIE6(
 920                                         $this->getFullRequestURL(), $extWhitelist );
 921                                 if ( $newUrl !== false ) {
 922                                         $this->doSecurityRedirect( $newUrl );
 923                                         return false;
 924                                 }
 925                         }
 926                         throw new HttpError( 403,
 927                                 'Invalid file extension found in the path info or query string.' );
 928                 }
 929                 return true;
 930         }
 931
 932         /**
 933          * Attempt to redirect to a URL with a QUERY_STRING that's not dangerous in
 934          * IE 6. Returns true if it was successful, false otherwise.
 935          *
 936          * @param $url string
 937          * @return bool
 938          */
 939         protected function doSecurityRedirect( $url ) {
 940                 header( 'Location: ' . $url );
 941                 header( 'Content-Type: text/html' );
 942                 $encUrl = htmlspecialchars( $url );
 943                 echo <<<HTML
 944 <html>
 945 <head>
 946 <title>Security redirect</title>
 947 </head>
 948 <body>
 949 <h1>Security redirect</h1>
 950 <p>
 951 We can't serve non-HTML content from the URL you have requested, because
 952 Internet Explorer would interpret it as an incorrect and potentially dangerous
 953 content type.</p>
 954 <p>Instead, please use <a href="$encUrl">this URL</a>, which is the same as the URL you have requested, except that
 955 "&amp;*" is appended. This prevents Internet Explorer from seeing a bogus file
 956 extension.
 957 </p>
 958 </body>
 959 </html>
 960 HTML;
 961                 echo "\n";
 962                 return true;
 963         }
 964
 965         /**
 966          * Returns true if the PATH_INFO ends with an extension other than a script
 967          * extension. This could confuse IE for scripts that send arbitrary data which
 968          * is not HTML but may be detected as such.
 969          *
 970          * Various past attempts to use the URL to make this check have generally
 971          * run up against the fact that CGI does not provide a standard method to
 972          * determine the URL. PATH_INFO may be mangled (e.g. if cgi.fix_pathinfo=0),
 973          * but only by prefixing it with the script name and maybe some other stuff,
 974          * the extension is not mangled. So this should be a reasonably portable
 975          * way to perform this security check.
 976          *
 977          * Also checks for anything that looks like a file extension at the end of
 978          * QUERY_STRING, since IE 6 and earlier will use this to get the file type
 979          * if there was no dot before the question mark (bug 28235).
 980          *
 981          * @deprecated Use checkUrlExtension().
 982          *
 983          * @param $extWhitelist array
 984          *
 985          * @return bool
 986          */
 987         public function isPathInfoBad( $extWhitelist = array() ) {
 988                 wfDeprecated( __METHOD__, '1.17' );
 989                 global $wgScriptExtension;
 990                 $extWhitelist[] = ltrim( $wgScriptExtension, '.' );
 991                 return IEUrlExtension::areServerVarsBad( $_SERVER, $extWhitelist );
 992         }
 993
 994         /**
 995          * Parse the Accept-Language header sent by the client into an array
 996          * @return array array( languageCode => q-value ) sorted by q-value in descending order then
 997          *                                                appearing time in the header in ascending order.
 998          * May contain the "language" '*', which applies to languages other than those explicitly listed.
 999          * This is aligned with rfc2616 section 14.4
1000          * Preference for earlier languages appears in rfc3282 as an extension to HTTP/1.1.
1001          */
1002         public function getAcceptLang() {
1003                 // Modified version of code found at http://www.thefutureoftheweb.com/blog/use-accept-language-header
1004                 $acceptLang = $this->getHeader( 'Accept-Language' );
1005                 if ( !$acceptLang ) {
1006                         return array();
1007                 }
1008
1009                 // Return the language codes in lower case
1010                 $acceptLang = strtolower( $acceptLang );
1011
1012                 // Break up string into pieces (languages and q factors)
1013                 $lang_parse = null;
1014                 preg_match_all( '/([a-z]{1,8}(-[a-z]{1,8})*|\*)\s*(;\s*q\s*=\s*(1(\.0{0,3})?|0(\.[0-9]{0,3})?)?)?/',
1015                         $acceptLang, $lang_parse );
1016
1017                 if ( !count( $lang_parse[1] ) ) {
1018                         return array();
1019                 }
1020
1021                 $langcodes = $lang_parse[1];
1022                 $qvalues = $lang_parse[4];
1023                 $indices = range( 0, count( $lang_parse[1] ) - 1 );
1024
1025                 // Set default q factor to 1
1026                 foreach ( $indices as $index ) {
1027                         if ( $qvalues[$index] === '' ) {
1028                                 $qvalues[$index] = 1;
1029                         } elseif ( $qvalues[$index] == 0 ) {
1030                                 unset( $langcodes[$index], $qvalues[$index], $indices[$index] );
1031                         }
1032                 }
1033
1034                 // Sort list. First by $qvalues, then by order. Reorder $langcodes the same way
1035                 array_multisort( $qvalues, SORT_DESC, SORT_NUMERIC, $indices, $langcodes );
1036
1037                 // Create a list like "en" => 0.8
1038                 $langs = array_combine( $langcodes, $qvalues );
1039
1040                 return $langs;
1041         }
1042
1043         /**
1044          * Fetch the raw IP from the request
1045          *
1046          * @since 1.19
1047          *
1048          * @return String
1049          */
1050         protected function getRawIP() {
1051                 if ( isset( $_SERVER['REMOTE_ADDR'] ) ) {
1052                         return IP::canonicalize( $_SERVER['REMOTE_ADDR'] );
1053                 } else {
1054                         return null;
1055                 }
1056         }
1057
1058         /**
1059          * Work out the IP address based on various globals
1060          * For trusted proxies, use the XFF client IP (first of the chain)
1061          *
1062          * @since 1.19
1063          *
1064          * @throws MWException
1065          * @return string
1066          */
1067         public function getIP() {
1068                 global $wgUsePrivateIPs;
1069
1070                 # Return cached result
1071                 if ( $this->ip !== null ) {
1072                         return $this->ip;
1073                 }
1074
1075                 # collect the originating ips
1076                 $ip = $this->getRawIP();
1077
1078                 # Append XFF
1079                 $forwardedFor = $this->getHeader( 'X-Forwarded-For' );
1080                 if ( $forwardedFor !== false ) {
1081                         $ipchain = array_map( 'trim', explode( ',', $forwardedFor ) );
1082                         $ipchain = array_reverse( $ipchain );
1083                         if ( $ip ) {
1084                                 array_unshift( $ipchain, $ip );
1085                         }
1086
1087                         # Step through XFF list and find the last address in the list which is a trusted server
1088                         # Set $ip to the IP address given by that trusted server, unless the address is not sensible (e.g. private)
1089                         foreach ( $ipchain as $i => $curIP ) {
1090                                 $curIP = IP::canonicalize( $curIP );
1091                                 if ( wfIsTrustedProxy( $curIP ) ) {
1092                                         if ( isset( $ipchain[$i + 1] ) ) {
1093                                                 if ( $wgUsePrivateIPs || IP::isPublic( $ipchain[$i + 1 ] ) ) {
1094                                                         $ip = $ipchain[$i + 1];
1095                                                 }
1096                                         }
1097                                 } else {
1098                                         break;
1099                                 }
1100                         }
1101                 }
1102
1103                 # Allow extensions to improve our guess
1104                 wfRunHooks( 'GetIP', array( &$ip ) );
1105
1106                 if ( !$ip ) {
1107                         throw new MWException( "Unable to determine IP" );
1108                 }
1109
1110                 wfDebug( "IP: $ip\n" );
1111                 $this->ip = $ip;
1112                 return $ip;
1113         }
1114 }
1115
1116 /**
1117  * Object to access the $_FILES array
1118  */
1119 class WebRequestUpload {
1120         protected $request;
1121         protected $doesExist;
1122         protected $fileInfo;
1123
1124         /**
1125          * Constructor. Should only be called by WebRequest
1126          *
1127          * @param $request WebRequest The associated request
1128          * @param $key string Key in $_FILES array (name of form field)
1129          */
1130         public function __construct( $request, $key ) {
1131                 $this->request = $request;
1132                 $this->doesExist = isset( $_FILES[$key] );
1133                 if ( $this->doesExist ) {
1134                         $this->fileInfo = $_FILES[$key];
1135                 }
1136         }
1137
1138         /**
1139          * Return whether a file with this name was uploaded.
1140          *
1141          * @return bool
1142          */
1143         public function exists() {
1144                 return $this->doesExist;
1145         }
1146
1147         /**
1148          * Return the original filename of the uploaded file
1149          *
1150          * @return mixed Filename or null if non-existent
1151          */
1152         public function getName() {
1153                 if ( !$this->exists() ) {
1154                         return null;
1155                 }
1156
1157                 global $wgContLang;
1158                 $name = $this->fileInfo['name'];
1159
1160                 # Safari sends filenames in HTML-encoded Unicode form D...
1161                 # Horrid and evil! Let's try to make some kind of sense of it.
1162                 $name = Sanitizer::decodeCharReferences( $name );
1163                 $name = $wgContLang->normalize( $name );
1164                 wfDebug( __METHOD__ . ": {$this->fileInfo['name']} normalized to '$name'\n" );
1165                 return $name;
1166         }
1167
1168         /**
1169          * Return the file size of the uploaded file
1170          *
1171          * @return int File size or zero if non-existent
1172          */
1173         public function getSize() {
1174                 if ( !$this->exists() ) {
1175                         return 0;
1176                 }
1177
1178                 return $this->fileInfo['size'];
1179         }
1180
1181         /**
1182          * Return the path to the temporary file
1183          *
1184          * @return mixed Path or null if non-existent
1185          */
1186         public function getTempName() {
1187                 if ( !$this->exists() ) {
1188                         return null;
1189                 }
1190
1191                 return $this->fileInfo['tmp_name'];
1192         }
1193
1194         /**
1195          * Return the upload error. See link for explanation
1196          * http://www.php.net/manual/en/features.file-upload.errors.php
1197          *
1198          * @return int One of the UPLOAD_ constants, 0 if non-existent
1199          */
1200         public function getError() {
1201                 if ( !$this->exists() ) {
1202                         return 0; # UPLOAD_ERR_OK
1203                 }
1204
1205                 return $this->fileInfo['error'];
1206         }
1207
1208         /**
1209          * Returns whether this upload failed because of overflow of a maximum set
1210          * in php.ini
1211          *
1212          * @return bool
1213          */
1214         public function isIniSizeOverflow() {
1215                 if ( $this->getError() == UPLOAD_ERR_INI_SIZE ) {
1216                         # PHP indicated that upload_max_filesize is exceeded
1217                         return true;
1218                 }
1219
1220                 $contentLength = $this->request->getHeader( 'CONTENT_LENGTH' );
1221                 if ( $contentLength > wfShorthandToInteger( ini_get( 'post_max_size' ) ) ) {
1222                         # post_max_size is exceeded
1223                         return true;
1224                 }
1225
1226                 return false;
1227         }
1228 }
1229
1230 /**
1231  * WebRequest clone which takes values from a provided array.
1232  *
1233  * @ingroup HTTP
1234  */
1235 class FauxRequest extends WebRequest {
1236         private $wasPosted = false;
1237         private $session = array();
1238
1239         /**
1240          * @param $data Array of *non*-urlencoded key => value pairs, the
1241          *   fake GET/POST values
1242          * @param $wasPosted Bool: whether to treat the data as POST
1243          * @param $session Mixed: session array or null
1244          * @throws MWException
1245          */
1246         public function __construct( $data = array(), $wasPosted = false, $session = null ) {
1247                 if( is_array( $data ) ) {
1248                         $this->data = $data;
1249                 } else {
1250                         throw new MWException( "FauxRequest() got bogus data" );
1251                 }
1252                 $this->wasPosted = $wasPosted;
1253                 if( $session )
1254                         $this->session = $session;
1255         }
1256
1257         /**
1258          * @param $method string
1259          * @throws MWException
1260          */
1261         private function notImplemented( $method ) {
1262                 throw new MWException( "{$method}() not implemented" );
1263         }
1264
1265         /**
1266          * @param $name string
1267          * @param $default string
1268          * @return string
1269          */
1270         public function getText( $name, $default = '' ) {
1271                 # Override; don't recode since we're using internal data
1272                 return (string)$this->getVal( $name, $default );
1273         }
1274
1275         /**
1276          * @return Array
1277          */
1278         public function getValues() {
1279                 return $this->data;
1280         }
1281
1282         /**
1283          * @return array
1284          */
1285         public function getQueryValues() {
1286                 if ( $this->wasPosted ) {
1287                         return array();
1288                 } else {
1289                         return $this->data;
1290                 }
1291         }
1292
1293         public function getMethod() {
1294                 return $this->wasPosted ? 'POST' : 'GET';
1295         }
1296
1297         /**
1298          * @return bool
1299          */
1300         public function wasPosted() {
1301                 return $this->wasPosted;
1302         }
1303
1304         public function checkSessionCookie() {
1305                 return false;
1306         }
1307
1308         public function getRequestURL() {
1309                 $this->notImplemented( __METHOD__ );
1310         }
1311
1312         /**
1313          * @param $name
1314          * @return bool|string
1315          */
1316         public function getHeader( $name ) {
1317                 return isset( $this->headers[$name] ) ? $this->headers[$name] : false;
1318         }
1319
1320         /**
1321          * @param $name string
1322          * @param $val string
1323          */
1324         public function setHeader( $name, $val ) {
1325                 $this->headers[$name] = $val;
1326         }
1327
1328         /**
1329          * @param $key
1330          * @return mixed
1331          */
1332         public function getSessionData( $key ) {
1333                 if( isset( $this->session[$key] ) )
1334                         return $this->session[$key];
1335         }
1336
1337         /**
1338          * @param $key
1339          * @param $data
1340          */
1341         public function setSessionData( $key, $data ) {
1342                 $this->session[$key] = $data;
1343         }
1344
1345         /**
1346          * @return array|Mixed|null
1347          */
1348         public function getSessionArray() {
1349                 return $this->session;
1350         }
1351
1352         /**
1353          * @param array $extWhitelist
1354          * @return bool
1355          */
1356         public function isPathInfoBad( $extWhitelist = array() ) {
1357                 return false;
1358         }
1359
1360         /**
1361          * @param array $extWhitelist
1362          * @return bool
1363          */
1364         public function checkUrlExtension( $extWhitelist = array() ) {
1365                 return true;
1366         }
1367
1368         /**
1369          * @return string
1370          */
1371         protected function getRawIP() {
1372                 return '127.0.0.1';
1373         }
1374 }
1375
1376 /**
1377  * Similar to FauxRequest, but only fakes URL parameters and method
1378  * (POST or GET) and use the base request for the remaining stuff
1379  * (cookies, session and headers).
1380  *
1381  * @ingroup HTTP
1382  * @since 1.19
1383  */
1384 class DerivativeRequest extends FauxRequest {
1385         private $base;
1386
1387         public function __construct( WebRequest $base, $data, $wasPosted = false ) {
1388                 $this->base = $base;
1389                 parent::__construct( $data, $wasPosted );
1390         }
1391
1392         public function getCookie( $key, $prefix = null, $default = null ) {
1393                 return $this->base->getCookie( $key, $prefix, $default );
1394         }
1395
1396         public function checkSessionCookie() {
1397                 return $this->base->checkSessionCookie();
1398         }
1399
1400         public function getHeader( $name ) {
1401                 return $this->base->getHeader( $name );
1402         }
1403
1404         public function getAllHeaders() {
1405                 return $this->base->getAllHeaders();
1406         }
1407
1408         public function getSessionData( $key ) {
1409                 return $this->base->getSessionData( $key );
1410         }
1411
1412         public function setSessionData( $key, $data ) {
1413                 $this->base->setSessionData( $key, $data );
1414         }
1415
1416         public function getAcceptLang() {
1417                 return $this->base->getAcceptLang();
1418         }
1419
1420         public function getIP() {
1421                 return $this->base->getIP();
1422         }
1423 }