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         private $_response;
  41
  42         public function __construct() {
  43                 /// @todo Fixme: this preemptive de-quoting can interfere with other web libraries
  44                 ///        and increases our memory footprint. It would be cleaner to do on
  45                 ///        demand; but currently we have no wrapper for $_SERVER etc.
  46                 $this->checkMagicQuotes();
  47
  48                 // POST overrides GET data
  49                 // We don't use $_REQUEST here to avoid interference from cookies...
  50                 $this->data = $_POST + $_GET;
  51         }
  52
  53         /**
  54          * Check for title, action, and/or variant data in the URL
  55          * and interpolate it into the GET variables.
  56          * This should only be run after $wgContLang is available,
  57          * as we may need the list of language variants to determine
  58          * available variant URLs.
  59          */
  60         public function interpolateTitle() {
  61                 global $wgUsePathInfo;
  62
  63                 if ( $wgUsePathInfo ) {
  64                         // PATH_INFO is mangled due to http://bugs.php.net/bug.php?id=31892
  65                         // And also by Apache 2.x, double slashes are converted to single slashes.
  66                         // So we will use REQUEST_URI if possible.
  67                         $matches = array();
  68
  69                         if ( !empty( $_SERVER['REQUEST_URI'] ) ) {
  70                                 // Slurp out the path portion to examine...
  71                                 $url = $_SERVER['REQUEST_URI'];
  72                                 if ( !preg_match( '!^https?://!', $url ) ) {
  73                                         $url = 'http://unused' . $url;
  74                                 }
  75                                 $a = parse_url( $url );
  76                                 if( $a ) {
  77                                         $path = isset( $a['path'] ) ? $a['path'] : '';
  78
  79                                         global $wgScript;
  80                                         if( $path == $wgScript ) {
  81                                                 // Script inside a rewrite path?
  82                                                 // Abort to keep from breaking...
  83                                                 return;
  84                                         }
  85                                         // Raw PATH_INFO style
  86                                         $matches = $this->extractTitle( $path, "$wgScript/$1" );
  87
  88                                         global $wgArticlePath;
  89                                         if( !$matches && $wgArticlePath ) {
  90                                                 $matches = $this->extractTitle( $path, $wgArticlePath );
  91                                         }
  92
  93                                         global $wgActionPaths;
  94                                         if( !$matches && $wgActionPaths ) {
  95                                                 $matches = $this->extractTitle( $path, $wgActionPaths, 'action' );
  96                                         }
  97
  98                                         global $wgVariantArticlePath, $wgContLang;
  99                                         if( !$matches && $wgVariantArticlePath ) {
 100                                                 $variantPaths = array();
 101                                                 foreach( $wgContLang->getVariants() as $variant ) {
 102                                                         $variantPaths[$variant] =
 103                                                                 str_replace( '$2', $variant, $wgVariantArticlePath );
 104                                                 }
 105                                                 $matches = $this->extractTitle( $path, $variantPaths, 'variant' );
 106                                         }
 107                                 }
 108                         } elseif ( isset( $_SERVER['ORIG_PATH_INFO'] ) && $_SERVER['ORIG_PATH_INFO'] != '' ) {
 109                                 // Mangled PATH_INFO
 110                                 // http://bugs.php.net/bug.php?id=31892
 111                                 // Also reported when ini_get('cgi.fix_pathinfo')==false
 112                                 $matches['title'] = substr( $_SERVER['ORIG_PATH_INFO'], 1 );
 113
 114                         } elseif ( isset( $_SERVER['PATH_INFO'] ) && ($_SERVER['PATH_INFO'] != '') ) {
 115                                 // Regular old PATH_INFO yay
 116                                 $matches['title'] = substr( $_SERVER['PATH_INFO'], 1 );
 117                         }
 118                         foreach( $matches as $key => $val) {
 119                                 $this->data[$key] = $_GET[$key] = $_REQUEST[$key] = $val;
 120                         }
 121                 }
 122         }
 123
 124         /**
 125          * Internal URL rewriting function; tries to extract page title and,
 126          * optionally, one other fixed parameter value from a URL path.
 127          *
 128          * @param $path string: the URL path given from the client
 129          * @param $bases array: one or more URLs, optionally with $1 at the end
 130          * @param $key string: if provided, the matching key in $bases will be
 131          *             passed on as the value of this URL parameter
 132          * @return array of URL variables to interpolate; empty if no match
 133          */
 134         private function extractTitle( $path, $bases, $key=false ) {
 135                 foreach( (array)$bases as $keyValue => $base ) {
 136                         // Find the part after $wgArticlePath
 137                         $base = str_replace( '$1', '', $base );
 138                         $baseLen = strlen( $base );
 139                         if( substr( $path, 0, $baseLen ) == $base ) {
 140                                 $raw = substr( $path, $baseLen );
 141                                 if( $raw !== '' ) {
 142                                         $matches = array( 'title' => rawurldecode( $raw ) );
 143                                         if( $key ) {
 144                                                 $matches[$key] = $keyValue;
 145                                         }
 146                                         return $matches;
 147                                 }
 148                         }
 149                 }
 150                 return array();
 151         }
 152
 153         /**
 154          * Recursively strips slashes from the given array;
 155          * used for undoing the evil that is magic_quotes_gpc.
 156          *
 157          * @param $arr array: will be modified
 158          * @return array the original array
 159          */
 160         private function &fix_magic_quotes( &$arr ) {
 161                 foreach( $arr as $key => $val ) {
 162                         if( is_array( $val ) ) {
 163                                 $this->fix_magic_quotes( $arr[$key] );
 164                         } else {
 165                                 $arr[$key] = stripslashes( $val );
 166                         }
 167                 }
 168                 return $arr;
 169         }
 170
 171         /**
 172          * If magic_quotes_gpc option is on, run the global arrays
 173          * through fix_magic_quotes to strip out the stupid slashes.
 174          * WARNING: This should only be done once! Running a second
 175          * time could damage the values.
 176          */
 177         private function checkMagicQuotes() {
 178                 $mustFixQuotes = function_exists( 'get_magic_quotes_gpc' )
 179                         && get_magic_quotes_gpc();
 180                 if( $mustFixQuotes ) {
 181                         $this->fix_magic_quotes( $_COOKIE );
 182                         $this->fix_magic_quotes( $_ENV );
 183                         $this->fix_magic_quotes( $_GET );
 184                         $this->fix_magic_quotes( $_POST );
 185                         $this->fix_magic_quotes( $_REQUEST );
 186                         $this->fix_magic_quotes( $_SERVER );
 187                 }
 188         }
 189
 190         /**
 191          * Recursively normalizes UTF-8 strings in the given array.
 192          *
 193          * @param $data string or array
 194          * @return cleaned-up version of the given
 195          * @private
 196          */
 197         function normalizeUnicode( $data ) {
 198                 if( is_array( $data ) ) {
 199                         foreach( $data as $key => $val ) {
 200                                 $data[$key] = $this->normalizeUnicode( $val );
 201                         }
 202                 } else {
 203                         global $wgContLang;
 204                         $data = $wgContLang->normalize( $data );
 205                 }
 206                 return $data;
 207         }
 208
 209         /**
 210          * Fetch a value from the given array or return $default if it's not set.
 211          *
 212          * @param $arr Array
 213          * @param $name String
 214          * @param $default Mixed
 215          * @return mixed
 216          */
 217         private function getGPCVal( $arr, $name, $default ) {
 218                 # PHP is so nice to not touch input data, except sometimes:
 219                 # http://us2.php.net/variables.external#language.variables.external.dot-in-names
 220                 # Work around PHP *feature* to avoid *bugs* elsewhere.
 221                 $name = strtr( $name, '.', '_' );
 222                 if( isset( $arr[$name] ) ) {
 223                         global $wgContLang;
 224                         $data = $arr[$name];
 225                         if( isset( $_GET[$name] ) && !is_array( $data ) ) {
 226                                 # Check for alternate/legacy character encoding.
 227                                 if( isset( $wgContLang ) ) {
 228                                         $data = $wgContLang->checkTitleEncoding( $data );
 229                                 }
 230                         }
 231                         $data = $this->normalizeUnicode( $data );
 232                         return $data;
 233                 } else {
 234                         taint( $default );
 235                         return $default;
 236                 }
 237         }
 238
 239         /**
 240          * Fetch a scalar from the input or return $default if it's not set.
 241          * Returns a string. Arrays are discarded. Useful for
 242          * non-freeform text inputs (e.g. predefined internal text keys
 243          * selected by a drop-down menu). For freeform input, see getText().
 244          *
 245          * @param $name String
 246          * @param $default String: optional default (or NULL)
 247          * @return String
 248          */
 249         public function getVal( $name, $default = null ) {
 250                 $val = $this->getGPCVal( $this->data, $name, $default );
 251                 if( is_array( $val ) ) {
 252                         $val = $default;
 253                 }
 254                 if( is_null( $val ) ) {
 255                         return $val;
 256                 } else {
 257                         return (string)$val;
 258                 }
 259         }
 260
 261         /**
 262          * Set an aribtrary value into our get/post data.
 263          *
 264          * @param $key String: key name to use
 265          * @param $value Mixed: value to set
 266          * @return Mixed: old value if one was present, null otherwise
 267          */
 268         public function setVal( $key, $value ) {
 269                 $ret = isset( $this->data[$key] ) ? $this->data[$key] : null;
 270                 $this->data[$key] = $value;
 271                 return $ret;
 272         }
 273
 274         /**
 275          * Fetch an array from the input or return $default if it's not set.
 276          * If source was scalar, will return an array with a single element.
 277          * If no source and no default, returns NULL.
 278          *
 279          * @param $name String
 280          * @param $default Array: optional default (or NULL)
 281          * @return Array
 282          */
 283         public function getArray( $name, $default = null ) {
 284                 $val = $this->getGPCVal( $this->data, $name, $default );
 285                 if( is_null( $val ) ) {
 286                         return null;
 287                 } else {
 288                         return (array)$val;
 289                 }
 290         }
 291
 292         /**
 293          * Fetch an array of integers, or return $default if it's not set.
 294          * If source was scalar, will return an array with a single element.
 295          * If no source and no default, returns NULL.
 296          * If an array is returned, contents are guaranteed to be integers.
 297          *
 298          * @param $name String
 299          * @param $default Array: option default (or NULL)
 300          * @return Array of ints
 301          */
 302         public function getIntArray( $name, $default = null ) {
 303                 $val = $this->getArray( $name, $default );
 304                 if( is_array( $val ) ) {
 305                         $val = array_map( 'intval', $val );
 306                 }
 307                 return $val;
 308         }
 309
 310         /**
 311          * Fetch an integer value from the input or return $default if not set.
 312          * Guaranteed to return an integer; non-numeric input will typically
 313          * return 0.
 314          *
 315          * @param $name String
 316          * @param $default Integer
 317          * @return Integer
 318          */
 319         public function getInt( $name, $default = 0 ) {
 320                 return intval( $this->getVal( $name, $default ) );
 321         }
 322
 323         /**
 324          * Fetch an integer value from the input or return null if empty.
 325          * Guaranteed to return an integer or null; non-numeric input will
 326          * typically return null.
 327          *
 328          * @param $name String
 329          * @return Integer
 330          */
 331         public function getIntOrNull( $name ) {
 332                 $val = $this->getVal( $name );
 333                 return is_numeric( $val )
 334                         ? intval( $val )
 335                         : null;
 336         }
 337
 338         /**
 339          * Fetch a boolean value from the input or return $default if not set.
 340          * Guaranteed to return true or false, with normal PHP semantics for
 341          * boolean interpretation of strings.
 342          *
 343          * @param $name String
 344          * @param $default Boolean
 345          * @return Boolean
 346          */
 347         public function getBool( $name, $default = false ) {
 348                 return $this->getVal( $name, $default ) ? true : false;
 349         }
 350
 351         /**
 352          * Return true if the named value is set in the input, whatever that
 353          * value is (even "0"). Return false if the named value is not set.
 354          * Example use is checking for the presence of check boxes in forms.
 355          *
 356          * @param $name String
 357          * @return Boolean
 358          */
 359         public function getCheck( $name ) {
 360                 # Checkboxes and buttons are only present when clicked
 361                 # Presence connotes truth, abscense false
 362                 $val = $this->getVal( $name, null );
 363                 return isset( $val );
 364         }
 365
 366         /**
 367          * Fetch a text string from the given array or return $default if it's not
 368          * set. Carriage returns are stripped from the text, and with some language
 369          * modules there is an input transliteration applied. This should generally
 370          * be used for form <textarea> and <input> fields. Used for user-supplied
 371          * freeform text input (for which input transformations may be required - e.g.
 372          * Esperanto x-coding).
 373          *
 374          * @param $name String
 375          * @param $default String: optional
 376          * @return String
 377          */
 378         public function getText( $name, $default = '' ) {
 379                 global $wgContLang;
 380                 $val = $this->getVal( $name, $default );
 381                 return str_replace( "\r\n", "\n",
 382                         $wgContLang->recodeInput( $val ) );
 383         }
 384
 385         /**
 386          * Extracts the given named values into an array.
 387          * If no arguments are given, returns all input values.
 388          * No transformation is performed on the values.
 389          */
 390         public function getValues() {
 391                 $names = func_get_args();
 392                 if ( count( $names ) == 0 ) {
 393                         $names = array_keys( $this->data );
 394                 }
 395
 396                 $retVal = array();
 397                 foreach ( $names as $name ) {
 398                         $value = $this->getVal( $name );
 399                         if ( !is_null( $value ) ) {
 400                                 $retVal[$name] = $value;
 401                         }
 402                 }
 403                 return $retVal;
 404         }
 405
 406         /**
 407          * Returns true if the present request was reached by a POST operation,
 408          * false otherwise (GET, HEAD, or command-line).
 409          *
 410          * Note that values retrieved by the object may come from the
 411          * GET URL etc even on a POST request.
 412          *
 413          * @return Boolean
 414          */
 415         public function wasPosted() {
 416                 return $_SERVER['REQUEST_METHOD'] == 'POST';
 417         }
 418
 419         /**
 420          * Returns true if there is a session cookie set.
 421          * This does not necessarily mean that the user is logged in!
 422          *
 423          * If you want to check for an open session, use session_id()
 424          * instead; that will also tell you if the session was opened
 425          * during the current request (in which case the cookie will
 426          * be sent back to the client at the end of the script run).
 427          *
 428          * @return Boolean
 429          */
 430         public function checkSessionCookie() {
 431                 return isset( $_COOKIE[ session_name() ] );
 432         }
 433
 434         /**
 435          * Get a cookie from the $_COOKIE jar
 436          *
 437          * @param $key String: the name of the cookie
 438          * @param $prefix String: a prefix to use for the cookie name, if not $wgCookiePrefix
 439          * @param $default Mixed: what to return if the value isn't found
 440          * @return Mixed: cookie value or $default if the cookie not set
 441          */
 442         public function getCookie( $key, $prefix = null, $default = null ) {
 443                 if( $prefix === null ) {
 444                         global $wgCookiePrefix;
 445                         $prefix = $wgCookiePrefix;
 446                 }
 447                 return $this->getGPCVal( $_COOKIE, $prefix . $key , $default );
 448         }
 449
 450         /**
 451          * Return the path portion of the request URI.
 452          *
 453          * @return String
 454          */
 455         public function getRequestURL() {
 456                 if( isset( $_SERVER['REQUEST_URI']) && strlen($_SERVER['REQUEST_URI']) ) {
 457                         $base = $_SERVER['REQUEST_URI'];
 458                 } elseif( isset( $_SERVER['SCRIPT_NAME'] ) ) {
 459                         // Probably IIS; doesn't set REQUEST_URI
 460                         $base = $_SERVER['SCRIPT_NAME'];
 461                         if( isset( $_SERVER['QUERY_STRING'] ) && $_SERVER['QUERY_STRING'] != '' ) {
 462                                 $base .= '?' . $_SERVER['QUERY_STRING'];
 463                         }
 464                 } else {
 465                         // This shouldn't happen!
 466                         throw new MWException( "Web server doesn't provide either " .
 467                                 "REQUEST_URI or SCRIPT_NAME. Report details of your " .
 468                                 "web server configuration to http://bugzilla.wikimedia.org/" );
 469                 }
 470                 // User-agents should not send a fragment with the URI, but
 471                 // if they do, and the web server passes it on to us, we
 472                 // need to strip it or we get false-positive redirect loops
 473                 // or weird output URLs
 474                 $hash = strpos( $base, '#' );
 475                 if( $hash !== false ) {
 476                         $base = substr( $base, 0, $hash );
 477                 }
 478                 if( $base{0} == '/' ) {
 479                         return $base;
 480                 } else {
 481                         // We may get paths with a host prepended; strip it.
 482                         return preg_replace( '!^[^:]+://[^/]+/!', '/', $base );
 483                 }
 484         }
 485
 486         /**
 487          * Return the request URI with the canonical service and hostname.
 488          *
 489          * @return String
 490          */
 491         public function getFullRequestURL() {
 492                 global $wgServer;
 493                 return $wgServer . $this->getRequestURL();
 494         }
 495
 496         /**
 497          * Take an arbitrary query and rewrite the present URL to include it
 498          * @param $query String: query string fragment; do not include initial '?'
 499          *
 500          * @return String
 501          */
 502         public function appendQuery( $query ) {
 503                 global $wgTitle;
 504                 $basequery = '';
 505                 foreach( $_GET as $var => $val ) {
 506                         if ( $var == 'title' )
 507                                 continue;
 508                         if ( is_array( $val ) )
 509                                 /* This will happen given a request like
 510                                  * http://en.wikipedia.org/w/index.php?title[]=Special:Userlogin&returnto[]=Main_Page
 511                                  */
 512                                 continue;
 513                         $basequery .= '&' . urlencode( $var ) . '=' . urlencode( $val );
 514                 }
 515                 $basequery .= '&' . $query;
 516
 517                 # Trim the extra &
 518                 $basequery = substr( $basequery, 1 );
 519                 return $wgTitle->getLocalURL( $basequery );
 520         }
 521
 522         /**
 523          * HTML-safe version of appendQuery().
 524          *
 525          * @param $query String: query string fragment; do not include initial '?'
 526          * @return String
 527          */
 528         public function escapeAppendQuery( $query ) {
 529                 return htmlspecialchars( $this->appendQuery( $query ) );
 530         }
 531
 532         public function appendQueryValue( $key, $value, $onlyquery = false ) {
 533                 return $this->appendQueryArray( array( $key => $value ), $onlyquery );
 534         }
 535
 536         /**
 537          * Appends or replaces value of query variables.
 538          *
 539          * @param $array Array of values to replace/add to query
 540          * @param $onlyquery Bool: whether to only return the query string and not
 541          *                   the complete URL
 542          * @return String
 543          */
 544         public function appendQueryArray( $array, $onlyquery = false ) {
 545                 global $wgTitle;
 546                 $newquery = $_GET;
 547                 unset( $newquery['title'] );
 548                 $newquery = array_merge( $newquery, $array );
 549                 $query = wfArrayToCGI( $newquery );
 550                 return $onlyquery ? $query : $wgTitle->getLocalURL( $query );
 551         }
 552
 553         /**
 554          * Check for limit and offset parameters on the input, and return sensible
 555          * defaults if not given. The limit must be positive and is capped at 5000.
 556          * Offset must be positive but is not capped.
 557          *
 558          * @param $deflimit Integer: limit to use if no input and the user hasn't set the option.
 559          * @param $optionname String: to specify an option other than rclimit to pull from.
 560          * @return array first element is limit, second is offset
 561          */
 562         public function getLimitOffset( $deflimit = 50, $optionname = 'rclimit' ) {
 563                 global $wgUser;
 564
 565                 $limit = $this->getInt( 'limit', 0 );
 566                 if( $limit < 0 ) {
 567                         $limit = 0;
 568                 }
 569                 if( ( $limit == 0 ) && ( $optionname != '' ) ) {
 570                         $limit = (int)$wgUser->getOption( $optionname );
 571                 }
 572                 if( $limit <= 0 ) {
 573                         $limit = $deflimit;
 574                 }
 575                 if( $limit > 5000 ) {
 576                         $limit = 5000; # We have *some* limits...
 577                 }
 578
 579                 $offset = $this->getInt( 'offset', 0 );
 580                 if( $offset < 0 ) {
 581                         $offset = 0;
 582                 }
 583
 584                 return array( $limit, $offset );
 585         }
 586
 587         /**
 588          * Return the path to the temporary file where PHP has stored the upload.
 589          *
 590          * @param $key String:
 591          * @return string or NULL if no such file.
 592          */
 593         public function getFileTempname( $key ) {
 594                 $file = new WebRequestUpload( $this, $key );
 595                 return $file->getTempName();
 596         }
 597
 598         /**
 599          * Return the size of the upload, or 0.
 600          *
 601          * @deprecated
 602          * @param $key String:
 603          * @return integer
 604          */
 605         public function getFileSize( $key ) {
 606                 $file = new WebRequestUpload( $this, $key );
 607                 return $file->getSize();
 608         }
 609
 610         /**
 611          * Return the upload error or 0
 612          *
 613          * @param $key String:
 614          * @return integer
 615          */
 616         public function getUploadError( $key ) {
 617                 $file = new WebRequestUpload( $this, $key );
 618                 return $file->getError();
 619         }
 620
 621         /**
 622          * Return the original filename of the uploaded file, as reported by
 623          * the submitting user agent. HTML-style character entities are
 624          * interpreted and normalized to Unicode normalization form C, in part
 625          * to deal with weird input from Safari with non-ASCII filenames.
 626          *
 627          * Other than this the name is not verified for being a safe filename.
 628          *
 629          * @param $key String:
 630          * @return string or NULL if no such file.
 631          */
 632         public function getFileName( $key ) {
 633                 $file = new WebRequestUpload( $this, $key );
 634                 return $file->getName();
 635         }
 636
 637         /**
 638          * Return a WebRequestUpload object corresponding to the key
 639          *
 640          * @param @key string
 641          * @return WebRequestUpload
 642          */
 643         public function getUpload( $key ) {
 644                 return new WebRequestUpload( $this, $key );
 645         }
 646
 647         /**
 648          * Return a handle to WebResponse style object, for setting cookies,
 649          * headers and other stuff, for Request being worked on.
 650          */
 651         public function response() {
 652                 /* Lazy initialization of response object for this request */
 653                 if ( !is_object( $this->_response ) ) {
 654                         $class = ( $this instanceof FauxRequest ) ? 'FauxResponse' : 'WebResponse';
 655                         $this->_response = new $class();
 656                 }
 657                 return $this->_response;
 658         }
 659
 660         /**
 661          * Get a request header, or false if it isn't set
 662          * @param $name String: case-insensitive header name
 663          */
 664         public function getHeader( $name ) {
 665                 $name = strtoupper( $name );
 666                 if ( function_exists( 'apache_request_headers' ) ) {
 667                         if ( !$this->headers ) {
 668                                 foreach ( apache_request_headers() as $tempName => $tempValue ) {
 669                                         $this->headers[ strtoupper( $tempName ) ] = $tempValue;
 670                                 }
 671                         }
 672                         if ( isset( $this->headers[$name] ) ) {
 673                                 return $this->headers[$name];
 674                         } else {
 675                                 return false;
 676                         }
 677                 } else {
 678                         $name = 'HTTP_' . str_replace( '-', '_', $name );
 679                         if ( $name === 'HTTP_CONTENT_LENGTH' && !isset( $_SERVER[$name] ) ) {
 680                                 $name = 'CONTENT_LENGTH';
 681                         }
 682                         if ( isset( $_SERVER[$name] ) ) {
 683                                 return $_SERVER[$name];
 684                         } else {
 685                                 return false;
 686                         }
 687                 }
 688         }
 689
 690         /**
 691          * Get data from $_SESSION
 692          *
 693          * @param $key String: name of key in $_SESSION
 694          * @return Mixed
 695          */
 696         public function getSessionData( $key ) {
 697                 if( !isset( $_SESSION[$key] ) ) {
 698                         return null;
 699                 }
 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          * May contain the "language" '*', which applies to languages other than those explicitly listed.
 744          * This is aligned with rfc2616 section 14.4
 745          */
 746         public function getAcceptLang() {
 747                 // Modified version of code found at http://www.thefutureoftheweb.com/blog/use-accept-language-header
 748                 $acceptLang = $this->getHeader( 'Accept-Language' );
 749                 if ( !$acceptLang ) {
 750                         return array();
 751                 }
 752
 753                 // Return the language codes in lower case
 754                 $acceptLang = strtolower( $acceptLang );
 755
 756                 // Break up string into pieces (languages and q factors)
 757                 $lang_parse = null;
 758                 preg_match_all( '/([a-z]{1,8}(-[a-z]{1,8})?|\*)\s*(;\s*q\s*=\s*(1|0(\.[0-9]+)?)?)?/',
 759                         $acceptLang, $lang_parse );
 760
 761                 if ( !count( $lang_parse[1] ) ) {
 762                         return array();
 763                 }
 764
 765                 // Create a list like "en" => 0.8
 766                 $langs = array_combine( $lang_parse[1], $lang_parse[4] );
 767                 // Set default q factor to 1
 768                 foreach ( $langs as $lang => $val ) {
 769                         if ( $val === '' ) {
 770                                 $langs[$lang] = 1;
 771                         } else if ( $val == 0 ) {
 772                                 unset($langs[$lang]);
 773                         }
 774                 }
 775
 776                 // Sort list
 777                 arsort( $langs, SORT_NUMERIC );
 778                 return $langs;
 779         }
 780 }
 781
 782 /**
 783  * Object to access the $_FILES array
 784  */
 785 class WebRequestUpload {
 786         protected $request;
 787         protected $doesExist;
 788         protected $fileInfo;
 789
 790         /**
 791          * Constructor. Should only be called by WebRequest
 792          *
 793          * @param $request WebRequest The associated request
 794          * @param $key string Key in $_FILES array (name of form field)
 795          */
 796         public function __construct( $request, $key ) {
 797                 $this->request = $request;
 798                 $this->doesExist = isset( $_FILES[$key] );
 799                 if ( $this->doesExist ) {
 800                         $this->fileInfo = $_FILES[$key];
 801                 }
 802         }
 803
 804         /**
 805          * Return whether a file with this name was uploaded.
 806          *
 807          * @return bool
 808          */
 809         public function exists() {
 810                 return $this->doesExist;
 811         }
 812
 813         /**
 814          * Return the original filename of the uploaded file
 815          *
 816          * @return mixed Filename or null if non-existent
 817          */
 818         public function getName() {
 819                 if ( !$this->exists() ) {
 820                         return null;
 821                 }
 822
 823                 global $wgContLang;
 824                 $name = $this->fileInfo['name'];
 825
 826                 # Safari sends filenames in HTML-encoded Unicode form D...
 827                 # Horrid and evil! Let's try to make some kind of sense of it.
 828                 $name = Sanitizer::decodeCharReferences( $name );
 829                 $name = $wgContLang->normalize( $name );
 830                 wfDebug( __METHOD__ . ": {$this->fileInfo['name']} normalized to '$name'\n" );
 831                 return $name;
 832         }
 833
 834         /**
 835          * Return the file size of the uploaded file
 836          *
 837          * @return int File size or zero if non-existent
 838          */
 839         public function getSize() {
 840                 if ( !$this->exists() ) {
 841                         return 0;
 842                 }
 843
 844                 return $this->fileInfo['size'];
 845         }
 846
 847         /**
 848          * Return the path to the temporary file
 849          *
 850          * @return mixed Path or null if non-existent
 851          */
 852         public function getTempName() {
 853                 if ( !$this->exists() ) {
 854                         return null;
 855                 }
 856
 857                 return $this->fileInfo['tmp_name'];
 858         }
 859
 860         /**
 861          * Return the upload error. See link for explanation
 862          * http://www.php.net/manual/en/features.file-upload.errors.php
 863          *
 864          * @return int One of the UPLOAD_ constants, 0 if non-existent
 865          */
 866         public function getError() {
 867                 if ( !$this->exists() ) {
 868                         return 0; # UPLOAD_ERR_OK
 869                 }
 870
 871                 return $this->fileInfo['error'];
 872         }
 873
 874         /**
 875          * Returns whether this upload failed because of overflow of a maximum set
 876          * in php.ini
 877          *
 878          * @return bool
 879          */
 880         public function isIniSizeOverflow() {
 881                 if ( $this->getError() == UPLOAD_ERR_INI_SIZE ) {
 882                         # PHP indicated that upload_max_filesize is exceeded
 883                         return true;
 884                 }
 885
 886                 $contentLength = $this->request->getHeader( 'CONTENT_LENGTH' );
 887                 if ( $contentLength > wfShorthandToInteger( ini_get( 'post_max_size' ) ) ) {
 888                         # post_max_size is exceeded
 889                         return true;
 890                 }
 891
 892                 return false;
 893         }
 894 }
 895
 896 /**
 897  * WebRequest clone which takes values from a provided array.
 898  *
 899  * @ingroup HTTP
 900  */
 901 class FauxRequest extends WebRequest {
 902         private $wasPosted = false;
 903         private $session = array();
 904
 905         /**
 906          * @param $data Array of *non*-urlencoded key => value pairs, the
 907          *   fake GET/POST values
 908          * @param $wasPosted Bool: whether to treat the data as POST
 909          * @param $session Mixed: session array or null
 910          */
 911         public function __construct( $data, $wasPosted = false, $session = null ) {
 912                 if( is_array( $data ) ) {
 913                         $this->data = $data;
 914                 } else {
 915                         throw new MWException( "FauxRequest() got bogus data" );
 916                 }
 917                 $this->wasPosted = $wasPosted;
 918                 if( $session )
 919                         $this->session = $session;
 920         }
 921
 922         private function notImplemented( $method ) {
 923                 throw new MWException( "{$method}() not implemented" );
 924         }
 925
 926         public function getText( $name, $default = '' ) {
 927                 # Override; don't recode since we're using internal data
 928                 return (string)$this->getVal( $name, $default );
 929         }
 930
 931         public function getValues() {
 932                 return $this->data;
 933         }
 934
 935         public function wasPosted() {
 936                 return $this->wasPosted;
 937         }
 938
 939         public function checkSessionCookie() {
 940                 return false;
 941         }
 942
 943         public function getRequestURL() {
 944                 $this->notImplemented( __METHOD__ );
 945         }
 946
 947         public function appendQuery( $query ) {
 948                 global $wgTitle;
 949                 $basequery = '';
 950                 foreach( $this->data as $var => $val ) {
 951                         if ( $var == 'title' ) {
 952                                 continue;
 953                         }
 954                         if ( is_array( $val ) ) {
 955                                 /* This will happen given a request like
 956                                  * http://en.wikipedia.org/w/index.php?title[]=Special:Userlogin&returnto[]=Main_Page
 957                                  */
 958                                 continue;
 959                         }
 960                         $basequery .= '&' . urlencode( $var ) . '=' . urlencode( $val );
 961                 }
 962                 $basequery .= '&' . $query;
 963
 964                 # Trim the extra &
 965                 $basequery = substr( $basequery, 1 );
 966                 return $wgTitle->getLocalURL( $basequery );
 967         }
 968
 969         public function getHeader( $name ) {
 970                 return isset( $this->headers[$name] ) ? $this->headers[$name] : false;
 971         }
 972
 973         public function setHeader( $name, $val ) {
 974                 $this->headers[$name] = $val;
 975         }
 976
 977         public function getSessionData( $key ) {
 978                 if( isset( $this->session[$key] ) )
 979                         return $this->session[$key];
 980         }
 981
 982         public function setSessionData( $key, $data ) {
 983                 $this->session[$key] = $data;
 984         }
 985
 986         public function isPathInfoBad() {
 987                 return false;
 988         }
 989 }