includes/WebRequest.php

   1 <?php
   2 /**
   3  * Deal with importing all those nasssty globals and things
   4  */
   5
   6 # Copyright (C) 2003 Brion Vibber <brion@pobox.com>
   7 # http://www.mediawiki.org/
   8 #
   9 # This program is free software; you can redistribute it and/or modify
  10 # it under the terms of the GNU General Public License as published by
  11 # the Free Software Foundation; either version 2 of the License, or
  12 # (at your option) any later version.
  13 #
  14 # This program is distributed in the hope that it will be useful,
  15 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17 # GNU General Public License for more details.
  18 #
  19 # You should have received a copy of the GNU General Public License along
  20 # with this program; if not, write to the Free Software Foundation, Inc.,
  21 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  22 # http://www.gnu.org/copyleft/gpl.html
  23
  24
  25 /**
  26  * Some entry points may use this file without first enabling the
  27  * autoloader.
  28  */
  29 if ( !function_exists( '__autoload' ) ) {
  30         require_once( dirname(__FILE__) . '/normal/UtfNormal.php' );
  31 }
  32
  33 /**
  34  * The WebRequest class encapsulates getting at data passed in the
  35  * URL or via a POSTed form, handling remove of "magic quotes" slashes,
  36  * stripping illegal input characters and normalizing Unicode sequences.
  37  *
  38  * Usually this is used via a global singleton, $wgRequest. You should
  39  * not create a second WebRequest object; make a FauxRequest object if
  40  * you want to pass arbitrary data to some function in place of the web
  41  * input.
  42  *
  43  * @ingroup HTTP
  44  */
  45 class WebRequest {
  46         protected $data, $headers = array();
  47         private $_response;
  48
  49         public function __construct() {
  50                 /// @todo Fixme: this preemptive de-quoting can interfere with other web libraries
  51                 ///        and increases our memory footprint. It would be cleaner to do on
  52                 ///        demand; but currently we have no wrapper for $_SERVER etc.
  53                 $this->checkMagicQuotes();
  54
  55                 // POST overrides GET data
  56                 // We don't use $_REQUEST here to avoid interference from cookies...
  57                 $this->data = $_POST + $_GET;
  58         }
  59
  60         /**
  61          * Check for title, action, and/or variant data in the URL
  62          * and interpolate it into the GET variables.
  63          * This should only be run after $wgContLang is available,
  64          * as we may need the list of language variants to determine
  65          * available variant URLs.
  66          */
  67         public function interpolateTitle() {
  68                 global $wgUsePathInfo;
  69
  70                 if ( $wgUsePathInfo ) {
  71                         // PATH_INFO is mangled due to http://bugs.php.net/bug.php?id=31892
  72                         // And also by Apache 2.x, double slashes are converted to single slashes.
  73                         // So we will use REQUEST_URI if possible.
  74                         $matches = array();
  75
  76                         if ( !empty( $_SERVER['REQUEST_URI'] ) ) {
  77                                 // Slurp out the path portion to examine...
  78                                 $url = $_SERVER['REQUEST_URI'];
  79                                 if ( !preg_match( '!^https?://!', $url ) ) {
  80                                         $url = 'http://unused' . $url;
  81                                 }
  82                                 $a = parse_url( $url );
  83                                 if( $a ) {
  84                                         $path = isset( $a['path'] ) ? $a['path'] : '';
  85
  86                                         global $wgScript;
  87                                         if( $path == $wgScript ) {
  88                                                 // Script inside a rewrite path?
  89                                                 // Abort to keep from breaking...
  90                                                 return;
  91                                         }
  92                                         // Raw PATH_INFO style
  93                                         $matches = $this->extractTitle( $path, "$wgScript/$1" );
  94
  95                                         global $wgArticlePath;
  96                                         if( !$matches && $wgArticlePath ) {
  97                                                 $matches = $this->extractTitle( $path, $wgArticlePath );
  98                                         }
  99
 100                                         global $wgActionPaths;
 101                                         if( !$matches && $wgActionPaths ) {
 102                                                 $matches = $this->extractTitle( $path, $wgActionPaths, 'action' );
 103                                         }
 104
 105                                         global $wgVariantArticlePath, $wgContLang;
 106                                         if( !$matches && $wgVariantArticlePath ) {
 107                                                 $variantPaths = array();
 108                                                 foreach( $wgContLang->getVariants() as $variant ) {
 109                                                         $variantPaths[$variant] =
 110                                                                 str_replace( '$2', $variant, $wgVariantArticlePath );
 111                                                 }
 112                                                 $matches = $this->extractTitle( $path, $variantPaths, 'variant' );
 113                                         }
 114                                 }
 115                         } elseif ( isset( $_SERVER['ORIG_PATH_INFO'] ) && $_SERVER['ORIG_PATH_INFO'] != '' ) {
 116                                 // Mangled PATH_INFO
 117                                 // http://bugs.php.net/bug.php?id=31892
 118                                 // Also reported when ini_get('cgi.fix_pathinfo')==false
 119                                 $matches['title'] = substr( $_SERVER['ORIG_PATH_INFO'], 1 );
 120
 121                         } elseif ( isset( $_SERVER['PATH_INFO'] ) && ($_SERVER['PATH_INFO'] != '') ) {
 122                                 // Regular old PATH_INFO yay
 123                                 $matches['title'] = substr( $_SERVER['PATH_INFO'], 1 );
 124                         }
 125                         foreach( $matches as $key => $val) {
 126                                 $this->data[$key] = $_GET[$key] = $_REQUEST[$key] = $val;
 127                         }
 128                 }
 129         }
 130
 131         /**
 132          * Internal URL rewriting function; tries to extract page title and,
 133          * optionally, one other fixed parameter value from a URL path.
 134          *
 135          * @param $path string: the URL path given from the client
 136          * @param $bases array: one or more URLs, optionally with $1 at the end
 137          * @param $key string: if provided, the matching key in $bases will be
 138          *             passed on as the value of this URL parameter
 139          * @return array of URL variables to interpolate; empty if no match
 140          */
 141         private function extractTitle( $path, $bases, $key=false ) {
 142                 foreach( (array)$bases as $keyValue => $base ) {
 143                         // Find the part after $wgArticlePath
 144                         $base = str_replace( '$1', '', $base );
 145                         $baseLen = strlen( $base );
 146                         if( substr( $path, 0, $baseLen ) == $base ) {
 147                                 $raw = substr( $path, $baseLen );
 148                                 if( $raw !== '' ) {
 149                                         $matches = array( 'title' => rawurldecode( $raw ) );
 150                                         if( $key ) {
 151                                                 $matches[$key] = $keyValue;
 152                                         }
 153                                         return $matches;
 154                                 }
 155                         }
 156                 }
 157                 return array();
 158         }
 159
 160         /**
 161          * Recursively strips slashes from the given array;
 162          * used for undoing the evil that is magic_quotes_gpc.
 163          *
 164          * @param $arr array: will be modified
 165          * @return array the original array
 166          */
 167         private function &fix_magic_quotes( &$arr ) {
 168                 foreach( $arr as $key => $val ) {
 169                         if( is_array( $val ) ) {
 170                                 $this->fix_magic_quotes( $arr[$key] );
 171                         } else {
 172                                 $arr[$key] = stripslashes( $val );
 173                         }
 174                 }
 175                 return $arr;
 176         }
 177
 178         /**
 179          * If magic_quotes_gpc option is on, run the global arrays
 180          * through fix_magic_quotes to strip out the stupid slashes.
 181          * WARNING: This should only be done once! Running a second
 182          * time could damage the values.
 183          */
 184         private function checkMagicQuotes() {
 185                 $mustFixQuotes = function_exists( 'get_magic_quotes_gpc' )
 186                         && get_magic_quotes_gpc();
 187                 if( $mustFixQuotes ) {
 188                         $this->fix_magic_quotes( $_COOKIE );
 189                         $this->fix_magic_quotes( $_ENV );
 190                         $this->fix_magic_quotes( $_GET );
 191                         $this->fix_magic_quotes( $_POST );
 192                         $this->fix_magic_quotes( $_REQUEST );
 193                         $this->fix_magic_quotes( $_SERVER );
 194                 }
 195         }
 196
 197         /**
 198          * Recursively normalizes UTF-8 strings in the given array.
 199          *
 200          * @param $data string or array
 201          * @return cleaned-up version of the given
 202          * @private
 203          */
 204         function normalizeUnicode( $data ) {
 205                 if( is_array( $data ) ) {
 206                         foreach( $data as $key => $val ) {
 207                                 $data[$key] = $this->normalizeUnicode( $val );
 208                         }
 209                 } else {
 210                         global $wgContLang;
 211                         $data = $wgContLang->normalize( $data );
 212                 }
 213                 return $data;
 214         }
 215
 216         /**
 217          * Fetch a value from the given array or return $default if it's not set.
 218          *
 219          * @param $arr Array
 220          * @param $name String
 221          * @param $default Mixed
 222          * @return mixed
 223          */
 224         private function getGPCVal( $arr, $name, $default ) {
 225                 # PHP is so nice to not touch input data, except sometimes:
 226                 # http://us2.php.net/variables.external#language.variables.external.dot-in-names
 227                 # Work around PHP *feature* to avoid *bugs* elsewhere.
 228                 $name = strtr( $name, '.', '_' );
 229                 if( isset( $arr[$name] ) ) {
 230                         global $wgContLang;
 231                         $data = $arr[$name];
 232                         if( isset( $_GET[$name] ) && !is_array( $data ) ) {
 233                                 # Check for alternate/legacy character encoding.
 234                                 if( isset( $wgContLang ) ) {
 235                                         $data = $wgContLang->checkTitleEncoding( $data );
 236                                 }
 237                         }
 238                         $data = $this->normalizeUnicode( $data );
 239                         return $data;
 240                 } else {
 241                         taint( $default );
 242                         return $default;
 243                 }
 244         }
 245
 246         /**
 247          * Fetch a scalar from the input or return $default if it's not set.
 248          * Returns a string. Arrays are discarded. Useful for
 249          * non-freeform text inputs (e.g. predefined internal text keys
 250          * selected by a drop-down menu). For freeform input, see getText().
 251          *
 252          * @param $name String
 253          * @param $default String: optional default (or NULL)
 254          * @return String
 255          */
 256         public function getVal( $name, $default = null ) {
 257                 $val = $this->getGPCVal( $this->data, $name, $default );
 258                 if( is_array( $val ) ) {
 259                         $val = $default;
 260                 }
 261                 if( is_null( $val ) ) {
 262                         return $val;
 263                 } else {
 264                         return (string)$val;
 265                 }
 266         }
 267
 268         /**
 269          * Set an aribtrary value into our get/post data.
 270          *
 271          * @param $key String: key name to use
 272          * @param $value Mixed: value to set
 273          * @return Mixed: old value if one was present, null otherwise
 274          */
 275         public function setVal( $key, $value ) {
 276                 $ret = isset( $this->data[$key] ) ? $this->data[$key] : null;
 277                 $this->data[$key] = $value;
 278                 return $ret;
 279         }
 280
 281         /**
 282          * Fetch an array from the input or return $default if it's not set.
 283          * If source was scalar, will return an array with a single element.
 284          * If no source and no default, returns NULL.
 285          *
 286          * @param $name String
 287          * @param $default Array: optional default (or NULL)
 288          * @return Array
 289          */
 290         public function getArray( $name, $default = null ) {
 291                 $val = $this->getGPCVal( $this->data, $name, $default );
 292                 if( is_null( $val ) ) {
 293                         return null;
 294                 } else {
 295                         return (array)$val;
 296                 }
 297         }
 298
 299         /**
 300          * Fetch an array of integers, or return $default if it's not set.
 301          * If source was scalar, will return an array with a single element.
 302          * If no source and no default, returns NULL.
 303          * If an array is returned, contents are guaranteed to be integers.
 304          *
 305          * @param $name String
 306          * @param $default Array: option default (or NULL)
 307          * @return Array of ints
 308          */
 309         public function getIntArray( $name, $default = null ) {
 310                 $val = $this->getArray( $name, $default );
 311                 if( is_array( $val ) ) {
 312                         $val = array_map( 'intval', $val );
 313                 }
 314                 return $val;
 315         }
 316
 317         /**
 318          * Fetch an integer value from the input or return $default if not set.
 319          * Guaranteed to return an integer; non-numeric input will typically
 320          * return 0.
 321          *
 322          * @param $name String
 323          * @param $default Integer
 324          * @return Integer
 325          */
 326         public function getInt( $name, $default = 0 ) {
 327                 return intval( $this->getVal( $name, $default ) );
 328         }
 329
 330         /**
 331          * Fetch an integer value from the input or return null if empty.
 332          * Guaranteed to return an integer or null; non-numeric input will
 333          * typically return null.
 334          *
 335          * @param $name String
 336          * @return Integer
 337          */
 338         public function getIntOrNull( $name ) {
 339                 $val = $this->getVal( $name );
 340                 return is_numeric( $val )
 341                         ? intval( $val )
 342                         : null;
 343         }
 344
 345         /**
 346          * Fetch a boolean value from the input or return $default if not set.
 347          * Guaranteed to return true or false, with normal PHP semantics for
 348          * boolean interpretation of strings.
 349          *
 350          * @param $name String
 351          * @param $default Boolean
 352          * @return Boolean
 353          */
 354         public function getBool( $name, $default = false ) {
 355                 return $this->getVal( $name, $default ) ? true : false;
 356         }
 357
 358         /**
 359          * Return true if the named value is set in the input, whatever that
 360          * value is (even "0"). Return false if the named value is not set.
 361          * Example use is checking for the presence of check boxes in forms.
 362          *
 363          * @param $name String
 364          * @return Boolean
 365          */
 366         public function getCheck( $name ) {
 367                 # Checkboxes and buttons are only present when clicked
 368                 # Presence connotes truth, abscense false
 369                 $val = $this->getVal( $name, null );
 370                 return isset( $val );
 371         }
 372
 373         /**
 374          * Fetch a text string from the given array or return $default if it's not
 375          * set. \r is stripped from the text, and with some language modules there
 376          * is an input transliteration applied. This should generally be used for
 377          * form <textarea> and <input> fields. Used for user-supplied freeform text
 378          * input (for which input transformations may be required - e.g. Esperanto
 379          * x-coding).
 380          *
 381          * @param $name String
 382          * @param $default String: optional
 383          * @return String
 384          */
 385         public function getText( $name, $default = '' ) {
 386                 global $wgContLang;
 387                 $val = $this->getVal( $name, $default );
 388                 return str_replace( "\r\n", "\n",
 389                         $wgContLang->recodeInput( $val ) );
 390         }
 391
 392         /**
 393          * Extracts the given named values into an array.
 394          * If no arguments are given, returns all input values.
 395          * No transformation is performed on the values.
 396          */
 397         public function getValues() {
 398                 $names = func_get_args();
 399                 if ( count( $names ) == 0 ) {
 400                         $names = array_keys( $this->data );
 401                 }
 402
 403                 $retVal = array();
 404                 foreach ( $names as $name ) {
 405                         $value = $this->getVal( $name );
 406                         if ( !is_null( $value ) ) {
 407                                 $retVal[$name] = $value;
 408                         }
 409                 }
 410                 return $retVal;
 411         }
 412
 413         /**
 414          * Returns true if the present request was reached by a POST operation,
 415          * false otherwise (GET, HEAD, or command-line).
 416          *
 417          * Note that values retrieved by the object may come from the
 418          * GET URL etc even on a POST request.
 419          *
 420          * @return Boolean
 421          */
 422         public function wasPosted() {
 423                 return $_SERVER['REQUEST_METHOD'] == 'POST';
 424         }
 425
 426         /**
 427          * Returns true if there is a session cookie set.
 428          * This does not necessarily mean that the user is logged in!
 429          *
 430          * If you want to check for an open session, use session_id()
 431          * instead; that will also tell you if the session was opened
 432          * during the current request (in which case the cookie will
 433          * be sent back to the client at the end of the script run).
 434          *
 435          * @return Boolean
 436          */
 437         public function checkSessionCookie() {
 438                 return isset( $_COOKIE[session_name()] );
 439         }
 440
 441         /**
 442          * Get a cookie from the $_COOKIE jar
 443          *
 444          * @param $key String: the name of the cookie
 445          * @param $default Mixed: what to return if the value isn't found
 446          * @param $prefix String: a prefix to use for the cookie name, if not $wgCookiePrefix
 447          * @return Mixed: cookie value or $default if the cookie not set
 448          */
 449         public function getCookie( $key, $default = null, $prefix = '' ) {
 450                 if( !$prefix ) {
 451                         global $wgCookiePrefix;
 452                         $prefix = $wgCookiePrefix;
 453                 }
 454                 return $this->getGPCVal( $_COOKIE, $prefix . $key , $default );
 455         }
 456
 457         /**
 458          * Return the path portion of the request URI.
 459          *
 460          * @return String
 461          */
 462         public function getRequestURL() {
 463                 if( isset( $_SERVER['REQUEST_URI']) && strlen($_SERVER['REQUEST_URI']) ) {
 464                         $base = $_SERVER['REQUEST_URI'];
 465                 } elseif( isset( $_SERVER['SCRIPT_NAME'] ) ) {
 466                         // Probably IIS; doesn't set REQUEST_URI
 467                         $base = $_SERVER['SCRIPT_NAME'];
 468                         if( isset( $_SERVER['QUERY_STRING'] ) && $_SERVER['QUERY_STRING'] != '' ) {
 469                                 $base .= '?' . $_SERVER['QUERY_STRING'];
 470                         }
 471                 } else {
 472                         // This shouldn't happen!
 473                         throw new MWException( "Web server doesn't provide either " .
 474                                 "REQUEST_URI or SCRIPT_NAME. Report details of your " .
 475                                 "web server configuration to http://bugzilla.wikimedia.org/" );
 476                 }
 477                 // User-agents should not send a fragment with the URI, but
 478                 // if they do, and the web server passes it on to us, we
 479                 // need to strip it or we get false-positive redirect loops
 480                 // or weird output URLs
 481                 $hash = strpos( $base, '#' );
 482                 if( $hash !== false ) {
 483                         $base = substr( $base, 0, $hash );
 484                 }
 485                 if( $base{0} == '/' ) {
 486                         return $base;
 487                 } else {
 488                         // We may get paths with a host prepended; strip it.
 489                         return preg_replace( '!^[^:]+://[^/]+/!', '/', $base );
 490                 }
 491         }
 492
 493         /**
 494          * Return the request URI with the canonical service and hostname.
 495          *
 496          * @return String
 497          */
 498         public function getFullRequestURL() {
 499                 global $wgServer;
 500                 return $wgServer . $this->getRequestURL();
 501         }
 502
 503         /**
 504          * Take an arbitrary query and rewrite the present URL to include it
 505          * @param $query String: query string fragment; do not include initial '?'
 506          *
 507          * @return String
 508          */
 509         public function appendQuery( $query ) {
 510                 global $wgTitle;
 511                 $basequery = '';
 512                 foreach( $_GET as $var => $val ) {
 513                         if ( $var == 'title' )
 514                                 continue;
 515                         if ( is_array( $val ) )
 516                                 /* This will happen given a request like
 517                                  * http://en.wikipedia.org/w/index.php?title[]=Special:Userlogin&returnto[]=Main_Page
 518                                  */
 519                                 continue;
 520                         $basequery .= '&' . urlencode( $var ) . '=' . urlencode( $val );
 521                 }
 522                 $basequery .= '&' . $query;
 523
 524                 # Trim the extra &
 525                 $basequery = substr( $basequery, 1 );
 526                 return $wgTitle->getLocalURL( $basequery );
 527         }
 528
 529         /**
 530          * HTML-safe version of appendQuery().
 531          *
 532          * @param $query String: query string fragment; do not include initial '?'
 533          * @return String
 534          */
 535         public function escapeAppendQuery( $query ) {
 536                 return htmlspecialchars( $this->appendQuery( $query ) );
 537         }
 538
 539         public function appendQueryValue( $key, $value, $onlyquery = false ) {
 540                 return $this->appendQueryArray( array( $key => $value ), $onlyquery );
 541         }
 542
 543         /**
 544          * Appends or replaces value of query variables.
 545          *
 546          * @param $array Array of values to replace/add to query
 547          * @param $onlyquery Bool: whether to only return the query string and not
 548          *                   the complete URL
 549          * @return String
 550          */
 551         public function appendQueryArray( $array, $onlyquery = false ) {
 552                 global $wgTitle;
 553                 $newquery = $_GET;
 554                 unset( $newquery['title'] );
 555                 $newquery = array_merge( $newquery, $array );
 556                 $query = wfArrayToCGI( $newquery );
 557                 return $onlyquery ? $query : $wgTitle->getLocalURL( $query );
 558         }
 559
 560         /**
 561          * Check for limit and offset parameters on the input, and return sensible
 562          * defaults if not given. The limit must be positive and is capped at 5000.
 563          * Offset must be positive but is not capped.
 564          *
 565          * @param $deflimit Integer: limit to use if no input and the user hasn't set the option.
 566          * @param $optionname String: to specify an option other than rclimit to pull from.
 567          * @return array first element is limit, second is offset
 568          */
 569         public function getLimitOffset( $deflimit = 50, $optionname = 'rclimit' ) {
 570                 global $wgUser;
 571
 572                 $limit = $this->getInt( 'limit', 0 );
 573                 if( $limit < 0 ) $limit = 0;
 574                 if( ( $limit == 0 ) && ( $optionname != '' ) ) {
 575                         $limit = (int)$wgUser->getOption( $optionname );
 576                 }
 577                 if( $limit <= 0 ) $limit = $deflimit;
 578                 if( $limit > 5000 ) $limit = 5000; # We have *some* limits...
 579
 580                 $offset = $this->getInt( 'offset', 0 );
 581                 if( $offset < 0 ) $offset = 0;
 582
 583                 return array( $limit, $offset );
 584         }
 585
 586         /**
 587          * Return the path to the temporary file where PHP has stored the upload.
 588          *
 589          * @param $key String:
 590          * @return string or NULL if no such file.
 591          */
 592         public function getFileTempname( $key ) {
 593                 if( !isset( $_FILES[$key] ) ) {
 594                         return null;
 595                 }
 596                 return $_FILES[$key]['tmp_name'];
 597         }
 598
 599         /**
 600          * Return the size of the upload, or 0.
 601          *
 602          * @param $key String:
 603          * @return integer
 604          */
 605         public function getFileSize( $key ) {
 606                 if( !isset( $_FILES[$key] ) ) {
 607                         return 0;
 608                 }
 609                 return $_FILES[$key]['size'];
 610         }
 611
 612         /**
 613          * Return the upload error or 0
 614          *
 615          * @param $key String:
 616          * @return integer
 617          */
 618         public function getUploadError( $key ) {
 619                 if( !isset( $_FILES[$key] ) || !isset( $_FILES[$key]['error'] ) ) {
 620                         return 0/*UPLOAD_ERR_OK*/;
 621                 }
 622                 return $_FILES[$key]['error'];
 623         }
 624
 625         /**
 626          * Return the original filename of the uploaded file, as reported by
 627          * the submitting user agent. HTML-style character entities are
 628          * interpreted and normalized to Unicode normalization form C, in part
 629          * to deal with weird input from Safari with non-ASCII filenames.
 630          *
 631          * Other than this the name is not verified for being a safe filename.
 632          *
 633          * @param $key String:
 634          * @return string or NULL if no such file.
 635          */
 636         public function getFileName( $key ) {
 637                 global $wgContLang;
 638                 if( !isset( $_FILES[$key] ) ) {
 639                         return null;
 640                 }
 641                 $name = $_FILES[$key]['name'];
 642
 643                 # Safari sends filenames in HTML-encoded Unicode form D...
 644                 # Horrid and evil! Let's try to make some kind of sense of it.
 645                 $name = Sanitizer::decodeCharReferences( $name );
 646                 $name = $wgContLang->normalize( $name );
 647                 wfDebug( "WebRequest::getFileName() '" . $_FILES[$key]['name'] . "' normalized to '$name'\n" );
 648                 return $name;
 649         }
 650
 651         /**
 652          * Return a handle to WebResponse style object, for setting cookies,
 653          * headers and other stuff, for Request being worked on.
 654          */
 655         public function response() {
 656                 /* Lazy initialization of response object for this request */
 657                 if ( !is_object( $this->_response ) ) {
 658                         $class = ( $this instanceof FauxRequest ) ? 'FauxResponse' : 'WebResponse';
 659                         $this->_response = new $class();
 660                 }
 661                 return $this->_response;
 662         }
 663
 664         /**
 665          * Get a request header, or false if it isn't set
 666          * @param $name String: case-insensitive header name
 667          */
 668         public function getHeader( $name ) {
 669                 $name = strtoupper( $name );
 670                 if ( function_exists( 'apache_request_headers' ) ) {
 671                         if ( !$this->headers ) {
 672                                 foreach ( apache_request_headers() as $tempName => $tempValue ) {
 673                                         $this->headers[ strtoupper( $tempName ) ] = $tempValue;
 674                                 }
 675                         }
 676                         if ( isset( $this->headers[$name] ) ) {
 677                                 return $this->headers[$name];
 678                         } else {
 679                                 return false;
 680                         }
 681                 } else {
 682                         $name = 'HTTP_' . str_replace( '-', '_', $name );
 683                         if ( isset( $_SERVER[$name] ) ) {
 684                                 return $_SERVER[$name];
 685                         } else {
 686                                 return false;
 687                         }
 688                 }
 689         }
 690
 691         /**
 692          * Get data from $_SESSION
 693          *
 694          * @param $key String: name of key in $_SESSION
 695          * @return Mixed
 696          */
 697         public function getSessionData( $key ) {
 698                 if( !isset( $_SESSION[$key] ) )
 699                         return null;
 700                 return $_SESSION[$key];
 701         }
 702
 703         /**
 704          * Set session data
 705          *
 706          * @param $key String: name of key in $_SESSION
 707          * @param $data Mixed
 708          */
 709         public function setSessionData( $key, $data ) {
 710                 $_SESSION[$key] = $data;
 711         }
 712
 713         /**
 714          * Returns true if the PATH_INFO ends with an extension other than a script
 715          * extension. This could confuse IE for scripts that send arbitrary data which
 716          * is not HTML but may be detected as such.
 717          *
 718          * Various past attempts to use the URL to make this check have generally
 719          * run up against the fact that CGI does not provide a standard method to
 720          * determine the URL. PATH_INFO may be mangled (e.g. if cgi.fix_pathinfo=0),
 721          * but only by prefixing it with the script name and maybe some other stuff,
 722          * the extension is not mangled. So this should be a reasonably portable
 723          * way to perform this security check.
 724          */
 725         public function isPathInfoBad() {
 726                 global $wgScriptExtension;
 727
 728                 if ( !isset( $_SERVER['PATH_INFO'] ) ) {
 729                         return false;
 730                 }
 731                 $pi = $_SERVER['PATH_INFO'];
 732                 $dotPos = strrpos( $pi, '.' );
 733                 if ( $dotPos === false ) {
 734                         return false;
 735                 }
 736                 $ext = substr( $pi, $dotPos );
 737                 return !in_array( $ext, array( $wgScriptExtension, '.php', '.php5' ) );
 738         }
 739
 740         /**
 741          * Parse the Accept-Language header sent by the client into an array
 742          * @return array( languageCode => q-value ) sorted by q-value in descending order
 743          */
 744         public function getAcceptLang() {
 745                 // Modified version of code found at http://www.thefutureoftheweb.com/blog/use-accept-language-header
 746                 if ( !isset( $_SERVER['HTTP_ACCEPT_LANGUAGE'] ) ) {
 747                         return array();
 748                 }
 749
 750                 // Break up string into pieces (languages and q factors)
 751                 $lang_parse = null;
 752                 preg_match_all( '/([a-z]{1,8}(-[a-z]{1,8})?)\s*(;\s*q\s*=\s*(1|0(\.[0-9]+))?)?/i',
 753                         $_SERVER['HTTP_ACCEPT_LANGUAGE'], $lang_parse );
 754
 755                 if ( !count( $lang_parse[1] ) ) {
 756                         return array();
 757                 }
 758                 // Create a list like "en" => 0.8
 759                 $langs = array_combine( $lang_parse[1], $lang_parse[4] );
 760                 // Set default q factor to 1
 761                 foreach ( $langs as $lang => $val ) {
 762                         if ( $val === '' ) {
 763                                 $langs[$lang] = 1;
 764                         }
 765                 }
 766                 // Sort list
 767                 arsort( $langs, SORT_NUMERIC );
 768                 return $langs;
 769         }
 770 }
 771
 772 /**
 773  * WebRequest clone which takes values from a provided array.
 774  *
 775  * @ingroup HTTP
 776  */
 777 class FauxRequest extends WebRequest {
 778         private $wasPosted = false;
 779         private $session = array();
 780
 781         /**
 782          * @param $data Array of *non*-urlencoded key => value pairs, the
 783          *   fake GET/POST values
 784          * @param $wasPosted Bool: whether to treat the data as POST
 785          * @param $session Mixed: session array or null
 786          */
 787         public function __construct( $data, $wasPosted = false, $session = null ) {
 788                 if( is_array( $data ) ) {
 789                         $this->data = $data;
 790                 } else {
 791                         throw new MWException( "FauxRequest() got bogus data" );
 792                 }
 793                 $this->wasPosted = $wasPosted;
 794                 if( $session )
 795                         $this->session = $session;
 796         }
 797
 798         private function notImplemented( $method ) {
 799                 throw new MWException( "{$method}() not implemented" );
 800         }
 801
 802         public function getText( $name, $default = '' ) {
 803                 # Override; don't recode since we're using internal data
 804                 return (string)$this->getVal( $name, $default );
 805         }
 806
 807         public function getValues() {
 808                 return $this->data;
 809         }
 810
 811         public function wasPosted() {
 812                 return $this->wasPosted;
 813         }
 814
 815         public function checkSessionCookie() {
 816                 return false;
 817         }
 818
 819         public function getRequestURL() {
 820                 $this->notImplemented( __METHOD__ );
 821         }
 822
 823         public function appendQuery( $query ) {
 824                 $this->notImplemented( __METHOD__ );
 825         }
 826
 827         public function getHeader( $name ) {
 828                 return isset( $this->headers[$name] ) ? $this->headers[$name] : false;
 829         }
 830
 831         public function setHeader( $name, $val ) {
 832                 $this->headers[$name] = $val;
 833         }
 834
 835         public function getSessionData( $key ) {
 836                 if( isset( $this->session[$key] ) )
 837                         return $this->session[$key];
 838         }
 839
 840         public function setSessionData( $key, $data ) {
 841                 $this->session[$key] = $data;
 842         }
 843
 844         public function isPathInfoBad() {
 845                 return false;
 846         }
 847 }