includes/WebRequest.php

   1 <?php
   2 /**
   3  * Deal with importing all those nasssty globals and things
   4  * @package MediaWiki
   5  */
   6
   7 # Copyright (C) 2003 Brion Vibber <brion@pobox.com>
   8 # http://www.mediawiki.org/
   9 #
  10 # This program is free software; you can redistribute it and/or modify
  11 # it under the terms of the GNU General Public License as published by
  12 # the Free Software Foundation; either version 2 of the License, or
  13 # (at your option) any later version.
  14 #
  15 # This program is distributed in the hope that it will be useful,
  16 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18 # GNU General Public License for more details.
  19 #
  20 # You should have received a copy of the GNU General Public License along
  21 # with this program; if not, write to the Free Software Foundation, Inc.,
  22 # 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23 # http://www.gnu.org/copyleft/gpl.html
  24
  25 /**
  26  * The WebRequest class encapsulates getting at data passed in the
  27  * URL or via a POSTed form, handling remove of "magic quotes" slashes,
  28  * stripping illegal input characters and normalizing Unicode sequences.
  29  *
  30  * Usually this is used via a global singleton, $wgRequest. You should
  31  * not create a second WebRequest object; make a FauxRequest object if
  32  * you want to pass arbitrary data to some function in place of the web
  33  * input.
  34  *
  35  * @package MediaWiki
  36  */
  37 class WebRequest {
  38         function WebRequest() {
  39                 $this->checkMagicQuotes();
  40                 global $wgUsePathInfo;
  41                 if( isset( $_SERVER['PATH_INFO'] ) && ($_SERVER['PATH_INFO'] != '') && $wgUsePathInfo ) {
  42                         # Stuff it!
  43                         $_GET['title'] = $_REQUEST['title'] =
  44                                 substr( $_SERVER['PATH_INFO'], 1 );
  45                 }
  46         }
  47
  48         /**
  49          * Recursively strips slashes from the given array;
  50          * used for undoing the evil that is magic_quotes_gpc.
  51          * @param array &$arr will be modified
  52          * @return array the original array
  53          * @private
  54          */
  55         function &fix_magic_quotes( &$arr ) {
  56                 foreach( $arr as $key => $val ) {
  57                         if( is_array( $val ) ) {
  58                                 $this->fix_magic_quotes( $arr[$key] );
  59                         } else {
  60                                 $arr[$key] = stripslashes( $val );
  61                         }
  62                 }
  63                 return $arr;
  64         }
  65
  66         /**
  67          * If magic_quotes_gpc option is on, run the global arrays
  68          * through fix_magic_quotes to strip out the stupid dlashes.
  69          * WARNING: This should only be done once! Running a second
  70          * time could damage the values.
  71          * @private
  72          */
  73         function checkMagicQuotes() {
  74                 if ( get_magic_quotes_gpc() ) {
  75                         $this->fix_magic_quotes( $_COOKIE );
  76                         $this->fix_magic_quotes( $_ENV );
  77                         $this->fix_magic_quotes( $_GET );
  78                         $this->fix_magic_quotes( $_POST );
  79                         $this->fix_magic_quotes( $_REQUEST );
  80                         $this->fix_magic_quotes( $_SERVER );
  81                 }
  82         }
  83
  84         /**
  85          * Recursively normalizes UTF-8 strings in the given array.
  86          * @param array $data string or array
  87          * @return cleaned-up version of the given
  88          * @private
  89          */
  90         function normalizeUnicode( $data ) {
  91                 if( is_array( $data ) ) {
  92                         foreach( $data as $key => $val ) {
  93                                 $data[$key] = $this->normalizeUnicode( $val );
  94                         }
  95                 } else {
  96                         $data = UtfNormal::cleanUp( $data );
  97                 }
  98                 return $data;
  99         }
 100
 101         /**
 102          * Fetch a value from the given array or return $default if it's not set.
 103          *
 104          * @param array &$arr
 105          * @param string $name
 106          * @param mixed $default
 107          * @return mixed
 108          * @private
 109          */
 110         function getGPCVal( &$arr, $name, $default ) {
 111                 if( isset( $arr[$name] ) ) {
 112                         global $wgServer, $wgContLang;
 113                         $data = $arr[$name];
 114                         if( isset( $_GET[$name] ) && !is_array( $data ) ) {
 115                                 # Check for alternate/legacy character encoding.
 116                                 if( isset( $wgContLang ) ) {
 117                                         $data = $wgContLang->checkTitleEncoding( $data );
 118                                 }
 119                         }
 120                         require_once( 'normal/UtfNormal.php' );
 121                         $data = $this->normalizeUnicode( $data );
 122                         return $data;
 123                 } else {
 124                         return $default;
 125                 }
 126         }
 127
 128         /**
 129          * Fetch a scalar from the input or return $default if it's not set.
 130          * Returns a string. Arrays are discarded.
 131          *
 132          * @param string $name
 133          * @param string $default optional default (or NULL)
 134          * @return string
 135          */
 136         function getVal( $name, $default = NULL ) {
 137                 $val = $this->getGPCVal( $_REQUEST, $name, $default );
 138                 if( is_array( $val ) ) {
 139                         $val = $default;
 140                 }
 141                 if( is_null( $val ) ) {
 142                         return null;
 143                 } else {
 144                         return (string)$val;
 145                 }
 146         }
 147
 148         /**
 149          * Fetch an array from the input or return $default if it's not set.
 150          * If source was scalar, will return an array with a single element.
 151          * If no source and no default, returns NULL.
 152          *
 153          * @param string $name
 154          * @param array $default optional default (or NULL)
 155          * @return array
 156          */
 157         function getArray( $name, $default = NULL ) {
 158                 $val = $this->getGPCVal( $_REQUEST, $name, $default );
 159                 if( is_null( $val ) ) {
 160                         return null;
 161                 } else {
 162                         return (array)$val;
 163                 }
 164         }
 165
 166         /**
 167          * Fetch an integer value from the input or return $default if not set.
 168          * Guaranteed to return an integer; non-numeric input will typically
 169          * return 0.
 170          * @param string $name
 171          * @param int $default
 172          * @return int
 173          */
 174         function getInt( $name, $default = 0 ) {
 175                 return IntVal( $this->getVal( $name, $default ) );
 176         }
 177
 178         /**
 179          * Fetch a boolean value from the input or return $default if not set.
 180          * Guaranteed to return true or false, with normal PHP semantics for
 181          * boolean interpretation of strings.
 182          * @param string $name
 183          * @param bool $default
 184          * @return bool
 185          */
 186         function getBool( $name, $default = false ) {
 187                 return $this->getVal( $name, $default ) ? true : false;
 188         }
 189
 190         /**
 191          * Return true if the named value is set in the input, whatever that
 192          * value is (even "0"). Return false if the named value is not set.
 193          * Example use is checking for the presence of check boxes in forms.
 194          * @param string $name
 195          * @return bool
 196          */
 197         function getCheck( $name ) {
 198                 # Checkboxes and buttons are only present when clicked
 199                 # Presence connotes truth, abscense false
 200                 $val = $this->getVal( $name, NULL );
 201                 return isset( $val );
 202         }
 203
 204         /**
 205          * Fetch a text string from the given array or return $default if it's not
 206          * set. \r is stripped from the text, and with some language modules there
 207          * is an input transliteration applied. This should generally be used for
 208          * form <textarea> and <input> fields.
 209          *
 210          * @param string $name
 211          * @param string $default optional
 212          * @return string
 213          */
 214         function getText( $name, $default = '' ) {
 215                 global $wgContLang;
 216                 $val = $this->getVal( $name, $default );
 217                 return str_replace( "\r\n", "\n",
 218                         $wgContLang->recodeInput( $val ) );
 219         }
 220
 221         /**
 222          * Extracts the given named values into an array.
 223          * If no arguments are given, returns all input values.
 224          * No transformation is performed on the values.
 225          */
 226         function getValues() {
 227                 $names = func_get_args();
 228                 if ( count( $names ) == 0 ) {
 229                         $names = array_keys( $_REQUEST );
 230                 }
 231
 232                 $retVal = array();
 233                 foreach ( $names as $name ) {
 234                         $value = $this->getVal( $name );
 235                         if ( !is_null( $value ) ) {
 236                                 $retVal[$name] = $value;
 237                         }
 238                 }
 239                 return $retVal;
 240         }
 241
 242         /**
 243          * Returns true if the present request was reached by a POST operation,
 244          * false otherwise (GET, HEAD, or command-line).
 245          *
 246          * Note that values retrieved by the object may come from the
 247          * GET URL etc even on a POST request.
 248          *
 249          * @return bool
 250          */
 251         function wasPosted() {
 252                 return $_SERVER['REQUEST_METHOD'] == 'POST';
 253         }
 254
 255         /**
 256          * Returns true if there is a session cookie set.
 257          * This does not necessarily mean that the user is logged in!
 258          *
 259          * @return bool
 260          */
 261         function checkSessionCookie() {
 262                 return isset( $_COOKIE[ini_get('session.name')] );
 263         }
 264
 265         /**
 266          * Return the path portion of the request URI.
 267          * @return string
 268          */
 269         function getRequestURL() {
 270                 return $_SERVER['REQUEST_URI'];
 271         }
 272
 273         /**
 274          * Return the request URI with the canonical service and hostname.
 275          * @return string
 276          */
 277         function getFullRequestURL() {
 278                 global $wgServer;
 279                 return $wgServer . $this->getRequestURL();
 280         }
 281
 282         /**
 283          * Take an arbitrary query and rewrite the present URL to include it
 284          * @param string $query Query string fragment; do not include initial '?'
 285          * @return string
 286          */
 287         function appendQuery( $query ) {
 288                 global $wgTitle;
 289                 $basequery = '';
 290                 foreach( $_GET as $var => $val ) {
 291                         if( $var == 'title' ) continue;
 292                         $basequery .= '&' . urlencode( $var ) . '=' . urlencode( $val );
 293                 }
 294                 $basequery .= '&' . $query;
 295
 296                 # Trim the extra &
 297                 $basequery = substr( $basequery, 1 );
 298                 return $wgTitle->getLocalURL( $basequery );
 299         }
 300
 301         /**
 302          * HTML-safe version of appendQuery().
 303          * @param string $query Query string fragment; do not include initial '?'
 304          * @return string
 305          */
 306         function escapeAppendQuery( $query ) {
 307                 return htmlspecialchars( $this->appendQuery( $query ) );
 308         }
 309
 310         /**
 311          * Check for limit and offset parameters on the input, and return sensible
 312          * defaults if not given. The limit must be positive and is capped at 5000.
 313          * Offset must be positive but is not capped.
 314          *
 315          * @param int $deflimit Limit to use if no input and the user hasn't set the option.
 316          * @param string $optionname To specify an option other than rclimit to pull from.
 317          * @return array first element is limit, second is offset
 318          */
 319         function getLimitOffset( $deflimit = 50, $optionname = 'rclimit' ) {
 320                 global $wgUser;
 321
 322                 $limit = $this->getInt( 'limit', 0 );
 323                 if( $limit < 0 ) $limit = 0;
 324                 if( ( $limit == 0 ) && ( $optionname != '' ) ) {
 325                         $limit = (int)$wgUser->getOption( $optionname );
 326                 }
 327                 if( $limit <= 0 ) $limit = $deflimit;
 328                 if( $limit > 5000 ) $limit = 5000; # We have *some* limits...
 329
 330                 $offset = $this->getInt( 'offset', 0 );
 331                 if( $offset < 0 ) $offset = 0;
 332
 333                 return array( $limit, $offset );
 334         }
 335
 336         /**
 337          * Return the path to the temporary file where PHP has stored the upload.
 338          * @param string $key
 339          * @return string or NULL if no such file.
 340          */
 341         function getFileTempname( $key ) {
 342                 if( !isset( $_FILES[$key] ) ) {
 343                         return NULL;
 344                 }
 345                 return $_FILES[$key]['tmp_name'];
 346         }
 347
 348         /**
 349          * Return the size of the upload, or 0.
 350          * @param string $key
 351          * @return integer
 352          */
 353         function getFileSize( $key ) {
 354                 if( !isset( $_FILES[$key] ) ) {
 355                         return 0;
 356                 }
 357                 return $_FILES[$key]['size'];
 358         }
 359
 360         /**
 361          * Return the original filename of the uploaded file, as reported by
 362          * the submitting user agent. HTML-style character entities are
 363          * interpreted and normalized to Unicode normalization form C, in part
 364          * to deal with weird input from Safari with non-ASCII filenames.
 365          *
 366          * Other than this the name is not verified for being a safe filename.
 367          *
 368          * @param string $key
 369          * @return string or NULL if no such file.
 370          */
 371         function getFileName( $key ) {
 372                 if( !isset( $_FILES[$key] ) ) {
 373                         return NULL;
 374                 }
 375                 $name = $_FILES[$key]['name'];
 376
 377                 # Safari sends filenames in HTML-encoded Unicode form D...
 378                 # Horrid and evil! Let's try to make some kind of sense of it.
 379                 $name = Sanitizer::decodeCharReferences( $name );
 380                 $name = UtfNormal::cleanUp( $name );
 381                 wfDebug( "WebRequest::getFileName() '" . $_FILES[$key]['name'] . "' normalized to '$name'\n" );
 382                 return $name;
 383         }
 384 }
 385
 386 /**
 387  * WebRequest clone which takes values from a provided array.
 388  *
 389  * @package MediaWiki
 390  */
 391 class FauxRequest extends WebRequest {
 392         var $data = null;
 393         var $wasPosted = false;
 394
 395         function FauxRequest( $data, $wasPosted = false ) {
 396                 if( is_array( $data ) ) {
 397                         $this->data = $data;
 398                 } else {
 399                         wfDebugDieBacktrace( "FauxRequest() got bogus data" );
 400                 }
 401                 $this->wasPosted = $wasPosted;
 402         }
 403
 404         function getVal( $name, $default = NULL ) {
 405                 return $this->getGPCVal( $this->data, $name, $default );
 406         }
 407
 408         function getText( $name, $default = '' ) {
 409                 # Override; don't recode since we're using internal data
 410                 return $this->getVal( $name, $default );
 411         }
 412
 413         function getValues() {
 414                 return $this->data;
 415         }
 416
 417         function wasPosted() {
 418                 return $this->wasPosted;
 419         }
 420
 421         function checkSessionCookie() {
 422                 return false;
 423         }
 424
 425         function getRequestURL() {
 426                 wfDebugDieBacktrace( 'FauxRequest::getRequestURL() not implemented' );
 427         }
 428
 429         function appendQuery( $query ) {
 430                 wfDebugDieBacktrace( 'FauxRequest::appendQuery() not implemented' );
 431         }
 432
 433 }
 434
 435 ?>