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 slashes.
  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 an integer value from the input or return null if empty.
 180          * Guaranteed to return an integer or null; non-numeric input will
 181          * typically return null.
 182          * @param string $name
 183          * @return int
 184          */
 185         function getIntOrNull( $name ) {
 186                 $val = $this->getVal( $name );
 187                 return is_numeric( $val )
 188                         ? intval( $val )
 189                         : null;
 190         }
 191
 192         /**
 193          * Fetch a boolean value from the input or return $default if not set.
 194          * Guaranteed to return true or false, with normal PHP semantics for
 195          * boolean interpretation of strings.
 196          * @param string $name
 197          * @param bool $default
 198          * @return bool
 199          */
 200         function getBool( $name, $default = false ) {
 201                 return $this->getVal( $name, $default ) ? true : false;
 202         }
 203
 204         /**
 205          * Return true if the named value is set in the input, whatever that
 206          * value is (even "0"). Return false if the named value is not set.
 207          * Example use is checking for the presence of check boxes in forms.
 208          * @param string $name
 209          * @return bool
 210          */
 211         function getCheck( $name ) {
 212                 # Checkboxes and buttons are only present when clicked
 213                 # Presence connotes truth, abscense false
 214                 $val = $this->getVal( $name, NULL );
 215                 return isset( $val );
 216         }
 217
 218         /**
 219          * Fetch a text string from the given array or return $default if it's not
 220          * set. \r is stripped from the text, and with some language modules there
 221          * is an input transliteration applied. This should generally be used for
 222          * form <textarea> and <input> fields.
 223          *
 224          * @param string $name
 225          * @param string $default optional
 226          * @return string
 227          */
 228         function getText( $name, $default = '' ) {
 229                 global $wgContLang;
 230                 $val = $this->getVal( $name, $default );
 231                 return str_replace( "\r\n", "\n",
 232                         $wgContLang->recodeInput( $val ) );
 233         }
 234
 235         /**
 236          * Extracts the given named values into an array.
 237          * If no arguments are given, returns all input values.
 238          * No transformation is performed on the values.
 239          */
 240         function getValues() {
 241                 $names = func_get_args();
 242                 if ( count( $names ) == 0 ) {
 243                         $names = array_keys( $_REQUEST );
 244                 }
 245
 246                 $retVal = array();
 247                 foreach ( $names as $name ) {
 248                         $value = $this->getVal( $name );
 249                         if ( !is_null( $value ) ) {
 250                                 $retVal[$name] = $value;
 251                         }
 252                 }
 253                 return $retVal;
 254         }
 255
 256         /**
 257          * Returns true if the present request was reached by a POST operation,
 258          * false otherwise (GET, HEAD, or command-line).
 259          *
 260          * Note that values retrieved by the object may come from the
 261          * GET URL etc even on a POST request.
 262          *
 263          * @return bool
 264          */
 265         function wasPosted() {
 266                 return $_SERVER['REQUEST_METHOD'] == 'POST';
 267         }
 268
 269         /**
 270          * Returns true if there is a session cookie set.
 271          * This does not necessarily mean that the user is logged in!
 272          *
 273          * @return bool
 274          */
 275         function checkSessionCookie() {
 276                 return isset( $_COOKIE[ini_get('session.name')] );
 277         }
 278
 279         /**
 280          * Return the path portion of the request URI.
 281          * @return string
 282          */
 283         function getRequestURL() {
 284                 $base = $_SERVER['REQUEST_URI'];
 285                 if( $base{0} == '/' ) {
 286                         return $base;
 287                 } else {
 288                         // We may get paths with a host prepended; strip it.
 289                         return preg_replace( '!^[^:]+://[^/]+/!', '/', $base );
 290                 }
 291         }
 292
 293         /**
 294          * Return the request URI with the canonical service and hostname.
 295          * @return string
 296          */
 297         function getFullRequestURL() {
 298                 global $wgServer;
 299                 return $wgServer . $this->getRequestURL();
 300         }
 301
 302         /**
 303          * Take an arbitrary query and rewrite the present URL to include it
 304          * @param string $query Query string fragment; do not include initial '?'
 305          * @return string
 306          */
 307         function appendQuery( $query ) {
 308                 global $wgTitle;
 309                 $basequery = '';
 310                 foreach( $_GET as $var => $val ) {
 311                         if( $var == 'title' ) continue;
 312                         $basequery .= '&' . urlencode( $var ) . '=' . urlencode( $val );
 313                 }
 314                 $basequery .= '&' . $query;
 315
 316                 # Trim the extra &
 317                 $basequery = substr( $basequery, 1 );
 318                 return $wgTitle->getLocalURL( $basequery );
 319         }
 320
 321         /**
 322          * HTML-safe version of appendQuery().
 323          * @param string $query Query string fragment; do not include initial '?'
 324          * @return string
 325          */
 326         function escapeAppendQuery( $query ) {
 327                 return htmlspecialchars( $this->appendQuery( $query ) );
 328         }
 329
 330         /**
 331          * Check for limit and offset parameters on the input, and return sensible
 332          * defaults if not given. The limit must be positive and is capped at 5000.
 333          * Offset must be positive but is not capped.
 334          *
 335          * @param int $deflimit Limit to use if no input and the user hasn't set the option.
 336          * @param string $optionname To specify an option other than rclimit to pull from.
 337          * @return array first element is limit, second is offset
 338          */
 339         function getLimitOffset( $deflimit = 50, $optionname = 'rclimit' ) {
 340                 global $wgUser;
 341
 342                 $limit = $this->getInt( 'limit', 0 );
 343                 if( $limit < 0 ) $limit = 0;
 344                 if( ( $limit == 0 ) && ( $optionname != '' ) ) {
 345                         $limit = (int)$wgUser->getOption( $optionname );
 346                 }
 347                 if( $limit <= 0 ) $limit = $deflimit;
 348                 if( $limit > 5000 ) $limit = 5000; # We have *some* limits...
 349
 350                 $offset = $this->getInt( 'offset', 0 );
 351                 if( $offset < 0 ) $offset = 0;
 352
 353                 return array( $limit, $offset );
 354         }
 355
 356         /**
 357          * Return the path to the temporary file where PHP has stored the upload.
 358          * @param string $key
 359          * @return string or NULL if no such file.
 360          */
 361         function getFileTempname( $key ) {
 362                 if( !isset( $_FILES[$key] ) ) {
 363                         return NULL;
 364                 }
 365                 return $_FILES[$key]['tmp_name'];
 366         }
 367
 368         /**
 369          * Return the size of the upload, or 0.
 370          * @param string $key
 371          * @return integer
 372          */
 373         function getFileSize( $key ) {
 374                 if( !isset( $_FILES[$key] ) ) {
 375                         return 0;
 376                 }
 377                 return $_FILES[$key]['size'];
 378         }
 379
 380         /**
 381          * Return the upload error or 0
 382          * @param string $key
 383          * @return integer
 384          */
 385         function getUploadError( $key ) {
 386                 if( !isset( $_FILES[$key] ) || !isset( $_FILES[$key]['error'] ) ) {
 387                         return 0/*UPLOAD_ERR_OK*/;
 388                 }
 389                 return $_FILES[$key]['error'];
 390         }
 391
 392         /**
 393          * Return the original filename of the uploaded file, as reported by
 394          * the submitting user agent. HTML-style character entities are
 395          * interpreted and normalized to Unicode normalization form C, in part
 396          * to deal with weird input from Safari with non-ASCII filenames.
 397          *
 398          * Other than this the name is not verified for being a safe filename.
 399          *
 400          * @param string $key
 401          * @return string or NULL if no such file.
 402          */
 403         function getFileName( $key ) {
 404                 if( !isset( $_FILES[$key] ) ) {
 405                         return NULL;
 406                 }
 407                 $name = $_FILES[$key]['name'];
 408
 409                 # Safari sends filenames in HTML-encoded Unicode form D...
 410                 # Horrid and evil! Let's try to make some kind of sense of it.
 411                 $name = Sanitizer::decodeCharReferences( $name );
 412                 $name = UtfNormal::cleanUp( $name );
 413                 wfDebug( "WebRequest::getFileName() '" . $_FILES[$key]['name'] . "' normalized to '$name'\n" );
 414                 return $name;
 415         }
 416 }
 417
 418 /**
 419  * WebRequest clone which takes values from a provided array.
 420  *
 421  * @package MediaWiki
 422  */
 423 class FauxRequest extends WebRequest {
 424         var $data = null;
 425         var $wasPosted = false;
 426
 427         function FauxRequest( $data, $wasPosted = false ) {
 428                 if( is_array( $data ) ) {
 429                         $this->data = $data;
 430                 } else {
 431                         wfDebugDieBacktrace( "FauxRequest() got bogus data" );
 432                 }
 433                 $this->wasPosted = $wasPosted;
 434         }
 435
 436         function getVal( $name, $default = NULL ) {
 437                 return $this->getGPCVal( $this->data, $name, $default );
 438         }
 439
 440         function getText( $name, $default = '' ) {
 441                 # Override; don't recode since we're using internal data
 442                 return $this->getVal( $name, $default );
 443         }
 444
 445         function getValues() {
 446                 return $this->data;
 447         }
 448
 449         function wasPosted() {
 450                 return $this->wasPosted;
 451         }
 452
 453         function checkSessionCookie() {
 454                 return false;
 455         }
 456
 457         function getRequestURL() {
 458                 wfDebugDieBacktrace( 'FauxRequest::getRequestURL() not implemented' );
 459         }
 460
 461         function appendQuery( $query ) {
 462                 wfDebugDieBacktrace( 'FauxRequest::appendQuery() not implemented' );
 463         }
 464
 465 }
 466
 467 ?>