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         public function __construct() {
  48                 /// @todo Fixme: this preemptive de-quoting can interfere with other web libraries
  49                 ///        and increases our memory footprint. It would be cleaner to do on
  50                 ///        demand; but currently we have no wrapper for $_SERVER etc.
  51                 $this->checkMagicQuotes();
  52
  53                 // POST overrides GET data
  54                 // We don't use $_REQUEST here to avoid interference from cookies...
  55                 $this->data = $_POST + $_GET;
  56         }
  57
  58         /**
  59          * Check for title, action, and/or variant data in the URL
  60          * and interpolate it into the GET variables.
  61          * This should only be run after $wgContLang is available,
  62          * as we may need the list of language variants to determine
  63          * available variant URLs.
  64          */
  65         public function interpolateTitle() {
  66                 global $wgUsePathInfo;
  67
  68                 // bug 16019: title interpolation on API queries is useless and sometimes harmful
  69                 if ( defined( 'MW_API' ) ) {
  70                         return;
  71                 }
  72
  73                 if ( $wgUsePathInfo ) {
  74                         // PATH_INFO is mangled due to http://bugs.php.net/bug.php?id=31892
  75                         // And also by Apache 2.x, double slashes are converted to single slashes.
  76                         // So we will use REQUEST_URI if possible.
  77                         $matches = array();
  78
  79                         if ( !empty( $_SERVER['REQUEST_URI'] ) ) {
  80                                 // Slurp out the path portion to examine...
  81                                 $url = $_SERVER['REQUEST_URI'];
  82                                 if ( !preg_match( '!^https?://!', $url ) ) {
  83                                         $url = 'http://unused' . $url;
  84                                 }
  85                                 $a = parse_url( $url );
  86                                 if( $a ) {
  87                                         $path = isset( $a['path'] ) ? $a['path'] : '';
  88
  89                                         global $wgScript;
  90                                         if( $path == $wgScript ) {
  91                                                 // Script inside a rewrite path?
  92                                                 // Abort to keep from breaking...
  93                                                 return;
  94                                         }
  95                                         // Raw PATH_INFO style
  96                                         $matches = $this->extractTitle( $path, "$wgScript/$1" );
  97
  98                                         global $wgArticlePath;
  99                                         if( !$matches && $wgArticlePath ) {
 100                                                 $matches = $this->extractTitle( $path, $wgArticlePath );
 101                                         }
 102
 103                                         global $wgActionPaths;
 104                                         if( !$matches && $wgActionPaths ) {
 105                                                 $matches = $this->extractTitle( $path, $wgActionPaths, 'action' );
 106                                         }
 107
 108                                         global $wgVariantArticlePath, $wgContLang;
 109                                         if( !$matches && $wgVariantArticlePath ) {
 110                                                 $variantPaths = array();
 111                                                 foreach( $wgContLang->getVariants() as $variant ) {
 112                                                         $variantPaths[$variant] =
 113                                                                 str_replace( '$2', $variant, $wgVariantArticlePath );
 114                                                 }
 115                                                 $matches = $this->extractTitle( $path, $variantPaths, 'variant' );
 116                                         }
 117                                 }
 118                         } elseif ( isset( $_SERVER['ORIG_PATH_INFO'] ) && $_SERVER['ORIG_PATH_INFO'] != '' ) {
 119                                 // Mangled PATH_INFO
 120                                 // http://bugs.php.net/bug.php?id=31892
 121                                 // Also reported when ini_get('cgi.fix_pathinfo')==false
 122                                 $matches['title'] = substr( $_SERVER['ORIG_PATH_INFO'], 1 );
 123
 124                         } elseif ( isset( $_SERVER['PATH_INFO'] ) && ($_SERVER['PATH_INFO'] != '') ) {
 125                                 // Regular old PATH_INFO yay
 126                                 $matches['title'] = substr( $_SERVER['PATH_INFO'], 1 );
 127                         }
 128                         foreach( $matches as $key => $val) {
 129                                 $this->data[$key] = $_GET[$key] = $_REQUEST[$key] = $val;
 130                         }
 131                 }
 132         }
 133
 134         /**
 135          * Internal URL rewriting function; tries to extract page title and,
 136          * optionally, one other fixed parameter value from a URL path.
 137          *
 138          * @param $path string: the URL path given from the client
 139          * @param $bases array: one or more URLs, optionally with $1 at the end
 140          * @param $key string: if provided, the matching key in $bases will be
 141          *             passed on as the value of this URL parameter
 142          * @return array of URL variables to interpolate; empty if no match
 143          */
 144         private function extractTitle( $path, $bases, $key=false ) {
 145                 foreach( (array)$bases as $keyValue => $base ) {
 146                         // Find the part after $wgArticlePath
 147                         $base = str_replace( '$1', '', $base );
 148                         $baseLen = strlen( $base );
 149                         if( substr( $path, 0, $baseLen ) == $base ) {
 150                                 $raw = substr( $path, $baseLen );
 151                                 if( $raw !== '' ) {
 152                                         $matches = array( 'title' => rawurldecode( $raw ) );
 153                                         if( $key ) {
 154                                                 $matches[$key] = $keyValue;
 155                                         }
 156                                         return $matches;
 157                                 }
 158                         }
 159                 }
 160                 return array();
 161         }
 162
 163         /**
 164          * Recursively strips slashes from the given array;
 165          * used for undoing the evil that is magic_quotes_gpc.
 166          *
 167          * @param $arr array: will be modified
 168          * @return array the original array
 169          */
 170         private function &fix_magic_quotes( &$arr ) {
 171                 foreach( $arr as $key => $val ) {
 172                         if( is_array( $val ) ) {
 173                                 $this->fix_magic_quotes( $arr[$key] );
 174                         } else {
 175                                 $arr[$key] = stripslashes( $val );
 176                         }
 177                 }
 178                 return $arr;
 179         }
 180
 181         /**
 182          * If magic_quotes_gpc option is on, run the global arrays
 183          * through fix_magic_quotes to strip out the stupid slashes.
 184          * WARNING: This should only be done once! Running a second
 185          * time could damage the values.
 186          */
 187         private function checkMagicQuotes() {
 188                 $mustFixQuotes = function_exists( 'get_magic_quotes_gpc' )
 189                         && get_magic_quotes_gpc();
 190                 if( $mustFixQuotes ) {
 191                         $this->fix_magic_quotes( $_COOKIE );
 192                         $this->fix_magic_quotes( $_ENV );
 193                         $this->fix_magic_quotes( $_GET );
 194                         $this->fix_magic_quotes( $_POST );
 195                         $this->fix_magic_quotes( $_REQUEST );
 196                         $this->fix_magic_quotes( $_SERVER );
 197                 }
 198         }
 199
 200         /**
 201          * Recursively normalizes UTF-8 strings in the given array.
 202          *
 203          * @param $data string or array
 204          * @return cleaned-up version of the given
 205          * @private
 206          */
 207         function normalizeUnicode( $data ) {
 208                 if( is_array( $data ) ) {
 209                         foreach( $data as $key => $val ) {
 210                                 $data[$key] = $this->normalizeUnicode( $val );
 211                         }
 212                 } else {
 213                         global $wgContLang;
 214                         $data = $wgContLang->normalize( $data );
 215                 }
 216                 return $data;
 217         }
 218
 219         /**
 220          * Fetch a value from the given array or return $default if it's not set.
 221          *
 222          * @param $arr Array
 223          * @param $name String
 224          * @param $default Mixed
 225          * @return mixed
 226          */
 227         private function getGPCVal( $arr, $name, $default ) {
 228                 # PHP is so nice to not touch input data, except sometimes:
 229                 # http://us2.php.net/variables.external#language.variables.external.dot-in-names
 230                 # Work around PHP *feature* to avoid *bugs* elsewhere.
 231                 $name = strtr( $name, '.', '_' );
 232                 if( isset( $arr[$name] ) ) {
 233                         global $wgContLang;
 234                         $data = $arr[$name];
 235                         if( isset( $_GET[$name] ) && !is_array( $data ) ) {
 236                                 # Check for alternate/legacy character encoding.
 237                                 if( isset( $wgContLang ) ) {
 238                                         $data = $wgContLang->checkTitleEncoding( $data );
 239                                 }
 240                         }
 241                         $data = $this->normalizeUnicode( $data );
 242                         return $data;
 243                 } else {
 244                         taint( $default );
 245                         return $default;
 246                 }
 247         }
 248
 249         /**
 250          * Fetch a scalar from the input or return $default if it's not set.
 251          * Returns a string. Arrays are discarded. Useful for
 252          * non-freeform text inputs (e.g. predefined internal text keys
 253          * selected by a drop-down menu). For freeform input, see getText().
 254          *
 255          * @param $name String
 256          * @param $default String: optional default (or NULL)
 257          * @return String
 258          */
 259         public function getVal( $name, $default = null ) {
 260                 $val = $this->getGPCVal( $this->data, $name, $default );
 261                 if( is_array( $val ) ) {
 262                         $val = $default;
 263                 }
 264                 if( is_null( $val ) ) {
 265                         return $val;
 266                 } else {
 267                         return (string)$val;
 268                 }
 269         }
 270
 271         /**
 272          * Set an aribtrary value into our get/post data.
 273          *
 274          * @param $key String: key name to use
 275          * @param $value Mixed: value to set
 276          * @return Mixed: old value if one was present, null otherwise
 277          */
 278         public function setVal( $key, $value ) {
 279                 $ret = isset( $this->data[$key] ) ? $this->data[$key] : null;
 280                 $this->data[$key] = $value;
 281                 return $ret;
 282         }
 283
 284         /**
 285          * Fetch an array from the input or return $default if it's not set.
 286          * If source was scalar, will return an array with a single element.
 287          * If no source and no default, returns NULL.
 288          *
 289          * @param $name String
 290          * @param $default Array: optional default (or NULL)
 291          * @return Array
 292          */
 293         public function getArray( $name, $default = null ) {
 294                 $val = $this->getGPCVal( $this->data, $name, $default );
 295                 if( is_null( $val ) ) {
 296                         return null;
 297                 } else {
 298                         return (array)$val;
 299                 }
 300         }
 301
 302         /**
 303          * Fetch an array of integers, or return $default if it's not set.
 304          * If source was scalar, will return an array with a single element.
 305          * If no source and no default, returns NULL.
 306          * If an array is returned, contents are guaranteed to be integers.
 307          *
 308          * @param $name String
 309          * @param $default Array: option default (or NULL)
 310          * @return Array of ints
 311          */
 312         public function getIntArray( $name, $default = null ) {
 313                 $val = $this->getArray( $name, $default );
 314                 if( is_array( $val ) ) {
 315                         $val = array_map( 'intval', $val );
 316                 }
 317                 return $val;
 318         }
 319
 320         /**
 321          * Fetch an integer value from the input or return $default if not set.
 322          * Guaranteed to return an integer; non-numeric input will typically
 323          * return 0.
 324          *
 325          * @param $name String
 326          * @param $default Integer
 327          * @return Integer
 328          */
 329         public function getInt( $name, $default = 0 ) {
 330                 return intval( $this->getVal( $name, $default ) );
 331         }
 332
 333         /**
 334          * Fetch an integer value from the input or return null if empty.
 335          * Guaranteed to return an integer or null; non-numeric input will
 336          * typically return null.
 337          *
 338          * @param $name String
 339          * @return Integer
 340          */
 341         public function getIntOrNull( $name ) {
 342                 $val = $this->getVal( $name );
 343                 return is_numeric( $val )
 344                         ? intval( $val )
 345                         : null;
 346         }
 347
 348         /**
 349          * Fetch a boolean value from the input or return $default if not set.
 350          * Guaranteed to return true or false, with normal PHP semantics for
 351          * boolean interpretation of strings.
 352          *
 353          * @param $name String
 354          * @param $default Boolean
 355          * @return Boolean
 356          */
 357         public function getBool( $name, $default = false ) {
 358                 return (bool)$this->getVal( $name, $default );
 359         }
 360
 361         /**
 362          * Fetch a boolean value from the input or return $default if not set.
 363          * Unlike getBool, the string "false" will result in boolean false, which is
 364          * useful when interpreting information sent from JavaScript.
 365          *
 366          * @param $name String
 367          * @param $default Boolean
 368          * @return Boolean
 369          */
 370         public function getFuzzyBool( $name, $default = false ) {
 371                 return $this->getBool( $name, $default ) && strcasecmp( $this->getVal( $name ), 'false' ) !== 0;
 372         }
 373
 374         /**
 375          * Return true if the named value is set in the input, whatever that
 376          * value is (even "0"). Return false if the named value is not set.
 377          * Example use is checking for the presence of check boxes in forms.
 378          *
 379          * @param $name String
 380          * @return Boolean
 381          */
 382         public function getCheck( $name ) {
 383                 # Checkboxes and buttons are only present when clicked
 384                 # Presence connotes truth, abscense false
 385                 $val = $this->getVal( $name, null );
 386                 return isset( $val );
 387         }
 388
 389         /**
 390          * Fetch a text string from the given array or return $default if it's not
 391          * set. Carriage returns are stripped from the text, and with some language
 392          * modules there is an input transliteration applied. This should generally
 393          * be used for form <textarea> and <input> fields. Used for user-supplied
 394          * freeform text input (for which input transformations may be required - e.g.
 395          * Esperanto x-coding).
 396          *
 397          * @param $name String
 398          * @param $default String: optional
 399          * @return String
 400          */
 401         public function getText( $name, $default = '' ) {
 402                 global $wgContLang;
 403                 $val = $this->getVal( $name, $default );
 404                 return str_replace( "\r\n", "\n",
 405                         $wgContLang->recodeInput( $val ) );
 406         }
 407
 408         /**
 409          * Extracts the given named values into an array.
 410          * If no arguments are given, returns all input values.
 411          * No transformation is performed on the values.
 412          */
 413         public function getValues() {
 414                 $names = func_get_args();
 415                 if ( count( $names ) == 0 ) {
 416                         $names = array_keys( $this->data );
 417                 }
 418
 419                 $retVal = array();
 420                 foreach ( $names as $name ) {
 421                         $value = $this->getVal( $name );
 422                         if ( !is_null( $value ) ) {
 423                                 $retVal[$name] = $value;
 424                         }
 425                 }
 426                 return $retVal;
 427         }
 428
 429         /**
 430          * Returns true if the present request was reached by a POST operation,
 431          * false otherwise (GET, HEAD, or command-line).
 432          *
 433          * Note that values retrieved by the object may come from the
 434          * GET URL etc even on a POST request.
 435          *
 436          * @return Boolean
 437          */
 438         public function wasPosted() {
 439                 return $_SERVER['REQUEST_METHOD'] == 'POST';
 440         }
 441
 442         /**
 443          * Returns true if there is a session cookie set.
 444          * This does not necessarily mean that the user is logged in!
 445          *
 446          * If you want to check for an open session, use session_id()
 447          * instead; that will also tell you if the session was opened
 448          * during the current request (in which case the cookie will
 449          * be sent back to the client at the end of the script run).
 450          *
 451          * @return Boolean
 452          */
 453         public function checkSessionCookie() {
 454                 return isset( $_COOKIE[ session_name() ] );
 455         }
 456
 457         /**
 458          * Get a cookie from the $_COOKIE jar
 459          *
 460          * @param $key String: the name of the cookie
 461          * @param $prefix String: a prefix to use for the cookie name, if not $wgCookiePrefix
 462          * @param $default Mixed: what to return if the value isn't found
 463          * @return Mixed: cookie value or $default if the cookie not set
 464          */
 465         public function getCookie( $key, $prefix = null, $default = null ) {
 466                 if( $prefix === null ) {
 467                         global $wgCookiePrefix;
 468                         $prefix = $wgCookiePrefix;
 469                 }
 470                 return $this->getGPCVal( $_COOKIE, $prefix . $key , $default );
 471         }
 472
 473         /**
 474          * Return the path portion of the request URI.
 475          *
 476          * @return String
 477          */
 478         public function getRequestURL() {
 479                 if( isset( $_SERVER['REQUEST_URI']) && strlen($_SERVER['REQUEST_URI']) ) {
 480                         $base = $_SERVER['REQUEST_URI'];
 481                 } elseif( isset( $_SERVER['SCRIPT_NAME'] ) ) {
 482                         // Probably IIS; doesn't set REQUEST_URI
 483                         $base = $_SERVER['SCRIPT_NAME'];
 484                         if( isset( $_SERVER['QUERY_STRING'] ) && $_SERVER['QUERY_STRING'] != '' ) {
 485                                 $base .= '?' . $_SERVER['QUERY_STRING'];
 486                         }
 487                 } else {
 488                         // This shouldn't happen!
 489                         throw new MWException( "Web server doesn't provide either " .
 490                                 "REQUEST_URI or SCRIPT_NAME. Report details of your " .
 491                                 "web server configuration to http://bugzilla.wikimedia.org/" );
 492                 }
 493                 // User-agents should not send a fragment with the URI, but
 494                 // if they do, and the web server passes it on to us, we
 495                 // need to strip it or we get false-positive redirect loops
 496                 // or weird output URLs
 497                 $hash = strpos( $base, '#' );
 498                 if( $hash !== false ) {
 499                         $base = substr( $base, 0, $hash );
 500                 }
 501                 if( $base{0} == '/' ) {
 502                         return $base;
 503                 } else {
 504                         // We may get paths with a host prepended; strip it.
 505                         return preg_replace( '!^[^:]+://[^/]+/!', '/', $base );
 506                 }
 507         }
 508
 509         /**
 510          * Return the request URI with the canonical service and hostname.
 511          *
 512          * @return String
 513          */
 514         public function getFullRequestURL() {
 515                 global $wgServer;
 516                 return $wgServer . $this->getRequestURL();
 517         }
 518
 519         /**
 520          * Take an arbitrary query and rewrite the present URL to include it
 521          * @param $query String: query string fragment; do not include initial '?'
 522          *
 523          * @return String
 524          */
 525         public function appendQuery( $query ) {
 526                 global $wgTitle;
 527                 $basequery = '';
 528                 foreach( $_GET as $var => $val ) {
 529                         if ( $var == 'title' )
 530                                 continue;
 531                         if ( is_array( $val ) )
 532                                 /* This will happen given a request like
 533                                  * http://en.wikipedia.org/w/index.php?title[]=Special:Userlogin&returnto[]=Main_Page
 534                                  */
 535                                 continue;
 536                         $basequery .= '&' . urlencode( $var ) . '=' . urlencode( $val );
 537                 }
 538                 $basequery .= '&' . $query;
 539
 540                 # Trim the extra &
 541                 $basequery = substr( $basequery, 1 );
 542                 return $wgTitle->getLocalURL( $basequery );
 543         }
 544
 545         /**
 546          * HTML-safe version of appendQuery().
 547          *
 548          * @param $query String: query string fragment; do not include initial '?'
 549          * @return String
 550          */
 551         public function escapeAppendQuery( $query ) {
 552                 return htmlspecialchars( $this->appendQuery( $query ) );
 553         }
 554
 555         public function appendQueryValue( $key, $value, $onlyquery = false ) {
 556                 return $this->appendQueryArray( array( $key => $value ), $onlyquery );
 557         }
 558
 559         /**
 560          * Appends or replaces value of query variables.
 561          *
 562          * @param $array Array of values to replace/add to query
 563          * @param $onlyquery Bool: whether to only return the query string and not
 564          *                   the complete URL
 565          * @return String
 566          */
 567         public function appendQueryArray( $array, $onlyquery = false ) {
 568                 global $wgTitle;
 569                 $newquery = $_GET;
 570                 unset( $newquery['title'] );
 571                 $newquery = array_merge( $newquery, $array );
 572                 $query = wfArrayToCGI( $newquery );
 573                 return $onlyquery ? $query : $wgTitle->getLocalURL( $query );
 574         }
 575
 576         /**
 577          * Check for limit and offset parameters on the input, and return sensible
 578          * defaults if not given. The limit must be positive and is capped at 5000.
 579          * Offset must be positive but is not capped.
 580          *
 581          * @param $deflimit Integer: limit to use if no input and the user hasn't set the option.
 582          * @param $optionname String: to specify an option other than rclimit to pull from.
 583          * @return array first element is limit, second is offset
 584          */
 585         public function getLimitOffset( $deflimit = 50, $optionname = 'rclimit' ) {
 586                 global $wgUser;
 587
 588                 $limit = $this->getInt( 'limit', 0 );
 589                 if( $limit < 0 ) {
 590                         $limit = 0;
 591                 }
 592                 if( ( $limit == 0 ) && ( $optionname != '' ) ) {
 593                         $limit = (int)$wgUser->getOption( $optionname );
 594                 }
 595                 if( $limit <= 0 ) {
 596                         $limit = $deflimit;
 597                 }
 598                 if( $limit > 5000 ) {
 599                         $limit = 5000; # We have *some* limits...
 600                 }
 601
 602                 $offset = $this->getInt( 'offset', 0 );
 603                 if( $offset < 0 ) {
 604                         $offset = 0;
 605                 }
 606
 607                 return array( $limit, $offset );
 608         }
 609
 610         /**
 611          * Return the path to the temporary file where PHP has stored the upload.
 612          *
 613          * @param $key String:
 614          * @return string or NULL if no such file.
 615          */
 616         public function getFileTempname( $key ) {
 617                 $file = new WebRequestUpload( $this, $key );
 618                 return $file->getTempName();
 619         }
 620
 621         /**
 622          * Return the size of the upload, or 0.
 623          *
 624          * @deprecated
 625          * @param $key String:
 626          * @return integer
 627          */
 628         public function getFileSize( $key ) {
 629                 $file = new WebRequestUpload( $this, $key );
 630                 return $file->getSize();
 631         }
 632
 633         /**
 634          * Return the upload error or 0
 635          *
 636          * @param $key String:
 637          * @return integer
 638          */
 639         public function getUploadError( $key ) {
 640                 $file = new WebRequestUpload( $this, $key );
 641                 return $file->getError();
 642         }
 643
 644         /**
 645          * Return the original filename of the uploaded file, as reported by
 646          * the submitting user agent. HTML-style character entities are
 647          * interpreted and normalized to Unicode normalization form C, in part
 648          * to deal with weird input from Safari with non-ASCII filenames.
 649          *
 650          * Other than this the name is not verified for being a safe filename.
 651          *
 652          * @param $key String:
 653          * @return string or NULL if no such file.
 654          */
 655         public function getFileName( $key ) {
 656                 $file = new WebRequestUpload( $this, $key );
 657                 return $file->getName();
 658         }
 659
 660         /**
 661          * Return a WebRequestUpload object corresponding to the key
 662          *
 663          * @param @key string
 664          * @return WebRequestUpload
 665          */
 666         public function getUpload( $key ) {
 667                 return new WebRequestUpload( $this, $key );
 668         }
 669
 670         /**
 671          * Return a handle to WebResponse style object, for setting cookies,
 672          * headers and other stuff, for Request being worked on.
 673          *
 674          * @return WebResponse
 675          */
 676         public function response() {
 677                 /* Lazy initialization of response object for this request */
 678                 if ( !is_object( $this->response ) ) {
 679                         $class = ( $this instanceof FauxRequest ) ? 'FauxResponse' : 'WebResponse';
 680                         $this->response = new $class();
 681                 }
 682                 return $this->response;
 683         }
 684
 685         /**
 686          * Get a request header, or false if it isn't set
 687          * @param $name String: case-insensitive header name
 688          */
 689         public function getHeader( $name ) {
 690                 $name = strtoupper( $name );
 691                 if ( function_exists( 'apache_request_headers' ) ) {
 692                         if ( !$this->headers ) {
 693                                 foreach ( apache_request_headers() as $tempName => $tempValue ) {
 694                                         $this->headers[ strtoupper( $tempName ) ] = $tempValue;
 695                                 }
 696                         }
 697                         if ( isset( $this->headers[$name] ) ) {
 698                                 return $this->headers[$name];
 699                         } else {
 700                                 return false;
 701                         }
 702                 } else {
 703                         $name = 'HTTP_' . str_replace( '-', '_', $name );
 704                         if ( $name === 'HTTP_CONTENT_LENGTH' && !isset( $_SERVER[$name] ) ) {
 705                                 $name = 'CONTENT_LENGTH';
 706                         }
 707                         if ( isset( $_SERVER[$name] ) ) {
 708                                 return $_SERVER[$name];
 709                         } else {
 710                                 return false;
 711                         }
 712                 }
 713         }
 714
 715         /**
 716          * Get data from $_SESSION
 717          *
 718          * @param $key String: name of key in $_SESSION
 719          * @return Mixed
 720          */
 721         public function getSessionData( $key ) {
 722                 if( !isset( $_SESSION[$key] ) ) {
 723                         return null;
 724                 }
 725                 return $_SESSION[$key];
 726         }
 727
 728         /**
 729          * Set session data
 730          *
 731          * @param $key String: name of key in $_SESSION
 732          * @param $data Mixed
 733          */
 734         public function setSessionData( $key, $data ) {
 735                 $_SESSION[$key] = $data;
 736         }
 737
 738         /**
 739          * Returns true if the PATH_INFO ends with an extension other than a script
 740          * extension. This could confuse IE for scripts that send arbitrary data which
 741          * is not HTML but may be detected as such.
 742          *
 743          * Various past attempts to use the URL to make this check have generally
 744          * run up against the fact that CGI does not provide a standard method to
 745          * determine the URL. PATH_INFO may be mangled (e.g. if cgi.fix_pathinfo=0),
 746          * but only by prefixing it with the script name and maybe some other stuff,
 747          * the extension is not mangled. So this should be a reasonably portable
 748          * way to perform this security check.
 749          */
 750         public function isPathInfoBad() {
 751                 global $wgScriptExtension;
 752
 753                 if ( !isset( $_SERVER['PATH_INFO'] ) ) {
 754                         return false;
 755                 }
 756                 $pi = $_SERVER['PATH_INFO'];
 757                 $dotPos = strrpos( $pi, '.' );
 758                 if ( $dotPos === false ) {
 759                         return false;
 760                 }
 761                 $ext = substr( $pi, $dotPos );
 762                 return !in_array( $ext, array( $wgScriptExtension, '.php', '.php5' ) );
 763         }
 764
 765         /**
 766          * Parse the Accept-Language header sent by the client into an array
 767          * @return array( languageCode => q-value ) sorted by q-value in descending order
 768          * May contain the "language" '*', which applies to languages other than those explicitly listed.
 769          * This is aligned with rfc2616 section 14.4
 770          */
 771         public function getAcceptLang() {
 772                 // Modified version of code found at http://www.thefutureoftheweb.com/blog/use-accept-language-header
 773                 $acceptLang = $this->getHeader( 'Accept-Language' );
 774                 if ( !$acceptLang ) {
 775                         return array();
 776                 }
 777
 778                 // Return the language codes in lower case
 779                 $acceptLang = strtolower( $acceptLang );
 780
 781                 // Break up string into pieces (languages and q factors)
 782                 $lang_parse = null;
 783                 preg_match_all( '/([a-z]{1,8}(-[a-z]{1,8})?|\*)\s*(;\s*q\s*=\s*(1|0(\.[0-9]+)?)?)?/',
 784                         $acceptLang, $lang_parse );
 785
 786                 if ( !count( $lang_parse[1] ) ) {
 787                         return array();
 788                 }
 789
 790                 // Create a list like "en" => 0.8
 791                 $langs = array_combine( $lang_parse[1], $lang_parse[4] );
 792                 // Set default q factor to 1
 793                 foreach ( $langs as $lang => $val ) {
 794                         if ( $val === '' ) {
 795                                 $langs[$lang] = 1;
 796                         } else if ( $val == 0 ) {
 797                                 unset($langs[$lang]);
 798                         }
 799                 }
 800
 801                 // Sort list
 802                 arsort( $langs, SORT_NUMERIC );
 803                 return $langs;
 804         }
 805 }
 806
 807 /**
 808  * Object to access the $_FILES array
 809  */
 810 class WebRequestUpload {
 811         protected $request;
 812         protected $doesExist;
 813         protected $fileInfo;
 814
 815         /**
 816          * Constructor. Should only be called by WebRequest
 817          *
 818          * @param $request WebRequest The associated request
 819          * @param $key string Key in $_FILES array (name of form field)
 820          */
 821         public function __construct( $request, $key ) {
 822                 $this->request = $request;
 823                 $this->doesExist = isset( $_FILES[$key] );
 824                 if ( $this->doesExist ) {
 825                         $this->fileInfo = $_FILES[$key];
 826                 }
 827         }
 828
 829         /**
 830          * Return whether a file with this name was uploaded.
 831          *
 832          * @return bool
 833          */
 834         public function exists() {
 835                 return $this->doesExist;
 836         }
 837
 838         /**
 839          * Return the original filename of the uploaded file
 840          *
 841          * @return mixed Filename or null if non-existent
 842          */
 843         public function getName() {
 844                 if ( !$this->exists() ) {
 845                         return null;
 846                 }
 847
 848                 global $wgContLang;
 849                 $name = $this->fileInfo['name'];
 850
 851                 # Safari sends filenames in HTML-encoded Unicode form D...
 852                 # Horrid and evil! Let's try to make some kind of sense of it.
 853                 $name = Sanitizer::decodeCharReferences( $name );
 854                 $name = $wgContLang->normalize( $name );
 855                 wfDebug( __METHOD__ . ": {$this->fileInfo['name']} normalized to '$name'\n" );
 856                 return $name;
 857         }
 858
 859         /**
 860          * Return the file size of the uploaded file
 861          *
 862          * @return int File size or zero if non-existent
 863          */
 864         public function getSize() {
 865                 if ( !$this->exists() ) {
 866                         return 0;
 867                 }
 868
 869                 return $this->fileInfo['size'];
 870         }
 871
 872         /**
 873          * Return the path to the temporary file
 874          *
 875          * @return mixed Path or null if non-existent
 876          */
 877         public function getTempName() {
 878                 if ( !$this->exists() ) {
 879                         return null;
 880                 }
 881
 882                 return $this->fileInfo['tmp_name'];
 883         }
 884
 885         /**
 886          * Return the upload error. See link for explanation
 887          * http://www.php.net/manual/en/features.file-upload.errors.php
 888          *
 889          * @return int One of the UPLOAD_ constants, 0 if non-existent
 890          */
 891         public function getError() {
 892                 if ( !$this->exists() ) {
 893                         return 0; # UPLOAD_ERR_OK
 894                 }
 895
 896                 return $this->fileInfo['error'];
 897         }
 898
 899         /**
 900          * Returns whether this upload failed because of overflow of a maximum set
 901          * in php.ini
 902          *
 903          * @return bool
 904          */
 905         public function isIniSizeOverflow() {
 906                 if ( $this->getError() == UPLOAD_ERR_INI_SIZE ) {
 907                         # PHP indicated that upload_max_filesize is exceeded
 908                         return true;
 909                 }
 910
 911                 $contentLength = $this->request->getHeader( 'CONTENT_LENGTH' );
 912                 if ( $contentLength > wfShorthandToInteger( ini_get( 'post_max_size' ) ) ) {
 913                         # post_max_size is exceeded
 914                         return true;
 915                 }
 916
 917                 return false;
 918         }
 919 }
 920
 921 /**
 922  * WebRequest clone which takes values from a provided array.
 923  *
 924  * @ingroup HTTP
 925  */
 926 class FauxRequest extends WebRequest {
 927         private $wasPosted = false;
 928         private $session = array();
 929
 930         /**
 931          * @param $data Array of *non*-urlencoded key => value pairs, the
 932          *   fake GET/POST values
 933          * @param $wasPosted Bool: whether to treat the data as POST
 934          * @param $session Mixed: session array or null
 935          */
 936         public function __construct( $data, $wasPosted = false, $session = null ) {
 937                 if( is_array( $data ) ) {
 938                         $this->data = $data;
 939                 } else {
 940                         throw new MWException( "FauxRequest() got bogus data" );
 941                 }
 942                 $this->wasPosted = $wasPosted;
 943                 if( $session )
 944                         $this->session = $session;
 945         }
 946
 947         private function notImplemented( $method ) {
 948                 throw new MWException( "{$method}() not implemented" );
 949         }
 950
 951         public function getText( $name, $default = '' ) {
 952                 # Override; don't recode since we're using internal data
 953                 return (string)$this->getVal( $name, $default );
 954         }
 955
 956         public function getValues() {
 957                 return $this->data;
 958         }
 959
 960         public function wasPosted() {
 961                 return $this->wasPosted;
 962         }
 963
 964         public function checkSessionCookie() {
 965                 return false;
 966         }
 967
 968         public function getRequestURL() {
 969                 $this->notImplemented( __METHOD__ );
 970         }
 971
 972         public function appendQuery( $query ) {
 973                 global $wgTitle;
 974                 $basequery = '';
 975                 foreach( $this->data as $var => $val ) {
 976                         if ( $var == 'title' ) {
 977                                 continue;
 978                         }
 979                         if ( is_array( $val ) ) {
 980                                 /* This will happen given a request like
 981                                  * http://en.wikipedia.org/w/index.php?title[]=Special:Userlogin&returnto[]=Main_Page
 982                                  */
 983                                 continue;
 984                         }
 985                         $basequery .= '&' . urlencode( $var ) . '=' . urlencode( $val );
 986                 }
 987                 $basequery .= '&' . $query;
 988
 989                 # Trim the extra &
 990                 $basequery = substr( $basequery, 1 );
 991                 return $wgTitle->getLocalURL( $basequery );
 992         }
 993
 994         public function getHeader( $name ) {
 995                 return isset( $this->headers[$name] ) ? $this->headers[$name] : false;
 996         }
 997
 998         public function setHeader( $name, $val ) {
 999                 $this->headers[$name] = $val;
1000         }
1001
1002         public function getSessionData( $key ) {
1003                 if( isset( $this->session[$key] ) )
1004                         return $this->session[$key];
1005         }
1006
1007         public function setSessionData( $key, $data ) {
1008                 $this->session[$key] = $data;
1009         }
1010
1011         public function isPathInfoBad() {
1012                 return false;
1013         }
1014 }