includes/SpecialUpload.php

   1 <?php
   2 /**
   3  *
   4  * @addtogroup SpecialPage
   5  */
   6
   7
   8 /**
   9  * Entry point
  10  */
  11 function wfSpecialUpload() {
  12         global $wgRequest;
  13         $form = new UploadForm( $wgRequest );
  14         $form->execute();
  15 }
  16
  17 /**
  18  * implements Special:Upload
  19  * @addtogroup SpecialPage
  20  */
  21 class UploadForm {
  22         /**#@+
  23          * @access private
  24          */
  25         var $mComment, $mLicense, $mIgnoreWarning, $mCurlError;
  26         var $mDestName, $mTempPath, $mFileSize, $mFileProps;
  27         var $mCopyrightStatus, $mCopyrightSource, $mReUpload, $mAction, $mUploadClicked;
  28         var $mSrcName, $mSessionKey, $mStashed, $mDesiredDestName, $mRemoveTempFile, $mSourceType;
  29         var $mDestWarningAck, $mCurlDestHandle;
  30         var $mLocalFile;
  31
  32         # Placeholders for text injection by hooks (must be HTML)
  33         # extensions should take care to _append_ to the present value
  34         var $uploadFormTextTop;
  35         var $uploadFormTextAfterSummary;
  36
  37         const SESSION_VERSION = 1;
  38         /**#@-*/
  39
  40         /**
  41          * Constructor : initialise object
  42          * Get data POSTed through the form and assign them to the object
  43          * @param $request Data posted.
  44          */
  45         function UploadForm( &$request ) {
  46                 global $wgAllowCopyUploads;
  47                 $this->mDesiredDestName   = $request->getText( 'wpDestFile' );
  48                 $this->mIgnoreWarning     = $request->getCheck( 'wpIgnoreWarning' );
  49                 $this->mComment           = $request->getText( 'wpUploadDescription' );
  50
  51                 if( !$request->wasPosted() ) {
  52                         # GET requests just give the main form; no data except destination
  53                         # filename and description
  54                         return;
  55                 }
  56
  57                 # Placeholders for text injection by hooks (empty per default)
  58                 $this->uploadFormTextTop = "";
  59                 $this->uploadFormTextAfterSummary = "";
  60
  61                 $this->mReUpload          = $request->getCheck( 'wpReUpload' );
  62                 $this->mUploadClicked     = $request->getCheck( 'wpUpload' );
  63
  64                 $this->mLicense           = $request->getText( 'wpLicense' );
  65                 $this->mCopyrightStatus   = $request->getText( 'wpUploadCopyStatus' );
  66                 $this->mCopyrightSource   = $request->getText( 'wpUploadSource' );
  67                 $this->mWatchthis         = $request->getBool( 'wpWatchthis' );
  68                 $this->mSourceType        = $request->getText( 'wpSourceType' );
  69                 $this->mDestWarningAck    = $request->getText( 'wpDestFileWarningAck' );
  70
  71                 $this->mAction            = $request->getVal( 'action' );
  72
  73                 $this->mSessionKey        = $request->getInt( 'wpSessionKey' );
  74                 if( !empty( $this->mSessionKey ) &&
  75                         isset( $_SESSION['wsUploadData'][$this->mSessionKey]['version'] ) &&
  76                         $_SESSION['wsUploadData'][$this->mSessionKey]['version'] == self::SESSION_VERSION ) {
  77                         /**
  78                          * Confirming a temporarily stashed upload.
  79                          * We don't want path names to be forged, so we keep
  80                          * them in the session on the server and just give
  81                          * an opaque key to the user agent.
  82                          */
  83                         $data = $_SESSION['wsUploadData'][$this->mSessionKey];
  84                         $this->mTempPath         = $data['mTempPath'];
  85                         $this->mFileSize         = $data['mFileSize'];
  86                         $this->mSrcName          = $data['mSrcName'];
  87                         $this->mFileProps        = $data['mFileProps'];
  88                         $this->mCurlError        = 0/*UPLOAD_ERR_OK*/;
  89                         $this->mStashed          = true;
  90                         $this->mRemoveTempFile   = false;
  91                 } else {
  92                         /**
  93                          *Check for a newly uploaded file.
  94                          */
  95                         if( $wgAllowCopyUploads && $this->mSourceType == 'web' ) {
  96                                 $this->initializeFromUrl( $request );
  97                         } else {
  98                                 $this->initializeFromUpload( $request );
  99                         }
 100                 }
 101         }
 102
 103         /**
 104          * Initialize the uploaded file from PHP data
 105          * @access private
 106          */
 107         function initializeFromUpload( $request ) {
 108                 $this->mTempPath       = $request->getFileTempName( 'wpUploadFile' );
 109                 $this->mFileSize       = $request->getFileSize( 'wpUploadFile' );
 110                 $this->mSrcName        = $request->getFileName( 'wpUploadFile' );
 111                 $this->mCurlError      = $request->getUploadError( 'wpUploadFile' );
 112                 $this->mSessionKey     = false;
 113                 $this->mStashed        = false;
 114                 $this->mRemoveTempFile = false; // PHP will handle this
 115         }
 116
 117         /**
 118          * Copy a web file to a temporary file
 119          * @access private
 120          */
 121         function initializeFromUrl( $request ) {
 122                 global $wgTmpDirectory;
 123                 $url = $request->getText( 'wpUploadFileURL' );
 124                 $local_file = tempnam( $wgTmpDirectory, 'WEBUPLOAD' );
 125
 126                 $this->mTempPath       = $local_file;
 127                 $this->mFileSize       = 0; # Will be set by curlCopy
 128                 $this->mCurlError      = $this->curlCopy( $url, $local_file );
 129                 $this->mSrcName        = array_pop( explode( '/', $url ) );
 130                 $this->mSessionKey     = false;
 131                 $this->mStashed        = false;
 132
 133                 // PHP won't auto-cleanup the file
 134                 $this->mRemoveTempFile = file_exists( $local_file );
 135         }
 136
 137         /**
 138          * Safe copy from URL
 139          * Returns true if there was an error, false otherwise
 140          */
 141         private function curlCopy( $url, $dest ) {
 142                 global $wgUser, $wgOut;
 143
 144                 if( !$wgUser->isAllowed( 'upload_by_url' ) ) {
 145                         $wgOut->permissionRequired( 'upload_by_url' );
 146                         return true;
 147                 }
 148
 149                 # Maybe remove some pasting blanks :-)
 150                 $url =  trim( $url );
 151                 if( stripos($url, 'http://') !== 0 && stripos($url, 'ftp://') !== 0 ) {
 152                         # Only HTTP or FTP URLs
 153                         $wgOut->errorPage( 'upload-proto-error', 'upload-proto-error-text' );
 154                         return true;
 155                 }
 156
 157                 # Open temporary file
 158                 $this->mCurlDestHandle = @fopen( $this->mTempPath, "wb" );
 159                 if( $this->mCurlDestHandle === false ) {
 160                         # Could not open temporary file to write in
 161                         $wgOut->errorPage( 'upload-file-error', 'upload-file-error-text');
 162                         return true;
 163                 }
 164
 165                 $ch = curl_init();
 166                 curl_setopt( $ch, CURLOPT_HTTP_VERSION, 1.0); # Probably not needed, but apparently can work around some bug
 167                 curl_setopt( $ch, CURLOPT_TIMEOUT, 10); # 10 seconds timeout
 168                 curl_setopt( $ch, CURLOPT_LOW_SPEED_LIMIT, 512); # 0.5KB per second minimum transfer speed
 169                 curl_setopt( $ch, CURLOPT_URL, $url);
 170                 curl_setopt( $ch, CURLOPT_WRITEFUNCTION, array( $this, 'uploadCurlCallback' ) );
 171                 curl_exec( $ch );
 172                 $error = curl_errno( $ch ) ? true : false;
 173                 $errornum =  curl_errno( $ch );
 174                 // if ( $error ) print curl_error ( $ch ) ; # Debugging output
 175                 curl_close( $ch );
 176
 177                 fclose( $this->mCurlDestHandle );
 178                 unset( $this->mCurlDestHandle );
 179                 if( $error ) {
 180                         unlink( $dest );
 181                         if( wfEmptyMsg( "upload-curl-error$errornum", wfMsg("upload-curl-error$errornum") ) )
 182                                 $wgOut->errorPage( 'upload-misc-error', 'upload-misc-error-text' );
 183                         else
 184                                 $wgOut->errorPage( "upload-curl-error$errornum", "upload-curl-error$errornum-text" );
 185                 }
 186
 187                 return $error;
 188         }
 189
 190         /**
 191          * Callback function for CURL-based web transfer
 192          * Write data to file unless we've passed the length limit;
 193          * if so, abort immediately.
 194          * @access private
 195          */
 196         function uploadCurlCallback( $ch, $data ) {
 197                 global $wgMaxUploadSize;
 198                 $length = strlen( $data );
 199                 $this->mFileSize += $length;
 200                 if( $this->mFileSize > $wgMaxUploadSize ) {
 201                         return 0;
 202                 }
 203                 fwrite( $this->mCurlDestHandle, $data );
 204                 return $length;
 205         }
 206
 207         /**
 208          * Start doing stuff
 209          * @access public
 210          */
 211         function execute() {
 212                 global $wgUser, $wgOut;
 213                 global $wgEnableUploads;
 214
 215                 # Check uploading enabled
 216                 if( !$wgEnableUploads ) {
 217                         $wgOut->showErrorPage( 'uploaddisabled', 'uploaddisabledtext', array( $this->mDesiredDestName ) );
 218                         return;
 219                 }
 220
 221                 # Check permissions
 222                 if( !$wgUser->isAllowed( 'upload' ) ) {
 223                         if( !$wgUser->isLoggedIn() ) {
 224                                 $wgOut->showErrorPage( 'uploadnologin', 'uploadnologintext' );
 225                         } else {
 226                                 $wgOut->permissionRequired( 'upload' );
 227                         }
 228                         return;
 229                 }
 230
 231                 # Check blocks
 232                 if( $wgUser->isBlocked() ) {
 233                         $wgOut->blockedPage();
 234                         return;
 235                 }
 236
 237                 if( wfReadOnly() ) {
 238                         $wgOut->readOnlyPage();
 239                         return;
 240                 }
 241
 242                 if( $this->mReUpload ) {
 243                         if( !$this->unsaveUploadedFile() ) {
 244                                 return;
 245                         }
 246                         $this->mainUploadForm();
 247                 } else if( 'submit' == $this->mAction || $this->mUploadClicked ) {
 248                         $this->processUpload();
 249                 } else {
 250                         $this->mainUploadForm();
 251                 }
 252
 253                 $this->cleanupTempFile();
 254         }
 255
 256         /* -------------------------------------------------------------- */
 257
 258         /**
 259          * Really do the upload
 260          * Checks are made in SpecialUpload::execute()
 261          * @access private
 262          */
 263         function processUpload() {
 264                 global $wgUser, $wgOut;
 265
 266                 if( !wfRunHooks( 'UploadForm:BeforeProcessing', array( &$this ) ) )
 267                 {
 268                         wfDebug( "Hook 'UploadForm:BeforeProcessing' broke processing the file." );
 269                         return false;
 270                 }
 271
 272                 /* Check for PHP error if any, requires php 4.2 or newer */
 273                 if( $this->mCurlError == 1/*UPLOAD_ERR_INI_SIZE*/ ) {
 274                         $this->mainUploadForm( wfMsgHtml( 'largefileserver' ) );
 275                         return;
 276                 }
 277
 278                 /**
 279                  * If there was no filename or a zero size given, give up quick.
 280                  */
 281                 if( trim( $this->mSrcName ) == '' || empty( $this->mFileSize ) ) {
 282                         $this->mainUploadForm( wfMsgHtml( 'emptyfile' ) );
 283                         return;
 284                 }
 285
 286                 # Chop off any directories in the given filename
 287                 if( $this->mDesiredDestName ) {
 288                         $basename = $this->mDesiredDestName;
 289                 } else {
 290                         $basename = $this->mSrcName;
 291                 }
 292                 $filtered = wfBaseName( $basename );
 293
 294                 /**
 295                  * We'll want to blacklist against *any* 'extension', and use
 296                  * only the final one for the whitelist.
 297                  */
 298                 list( $partname, $ext ) = $this->splitExtensions( $filtered );
 299
 300                 if( count( $ext ) ) {
 301                         $finalExt = $ext[count( $ext ) - 1];
 302                 } else {
 303                         $finalExt = '';
 304                 }
 305
 306                 # If there was more than one "extension", reassemble the base
 307                 # filename to prevent bogus complaints about length
 308                 if( count( $ext ) > 1 ) {
 309                         for( $i = 0; $i < count( $ext ) - 1; $i++ )
 310                                 $partname .= '.' . $ext[$i];
 311                 }
 312
 313                 if( strlen( $partname ) < 1 ) {
 314                         $this->mainUploadForm( wfMsgHtml( 'minlength1' ) );
 315                         return;
 316                 }
 317
 318                 /**
 319                  * Filter out illegal characters, and try to make a legible name
 320                  * out of it. We'll strip some silently that Title would die on.
 321                  */
 322                 $filtered = preg_replace ( "/[^".Title::legalChars()."]|:/", '-', $filtered );
 323                 $nt = Title::makeTitleSafe( NS_IMAGE, $filtered );
 324                 if( is_null( $nt ) ) {
 325                         $this->uploadError( wfMsgWikiHtml( 'illegalfilename', htmlspecialchars( $filtered ) ) );
 326                         return;
 327                 }
 328                 $this->mLocalFile = wfLocalFile( $nt );
 329                 $this->mDestName = $this->mLocalFile->getName();
 330
 331                 /**
 332                  * If the image is protected, non-sysop users won't be able
 333                  * to modify it by uploading a new revision.
 334                  */
 335                 if( !$nt->userCan( 'edit' ) ) {
 336                         return $this->uploadError( wfMsgWikiHtml( 'protectedpage' ) );
 337                 }
 338
 339                 /**
 340                  * In some cases we may forbid overwriting of existing files.
 341                  */
 342                 $overwrite = $this->checkOverwrite( $this->mDestName );
 343                 if( WikiError::isError( $overwrite ) ) {
 344                         return $this->uploadError( $overwrite->toString() );
 345                 }
 346
 347                 /* Don't allow users to override the blacklist (check file extension) */
 348                 global $wgStrictFileExtensions;
 349                 global $wgFileExtensions, $wgFileBlacklist;
 350                 if ($finalExt == '') {
 351                         return $this->uploadError( wfMsgExt( 'filetype-missing', array ( 'parseinline' ) ) );
 352                 } elseif ( $this->checkFileExtensionList( $ext, $wgFileBlacklist ) ||
 353                                 ($wgStrictFileExtensions && !$this->checkFileExtension( $finalExt, $wgFileExtensions ) ) ) {
 354                         return $this->uploadError( wfMsgExt( 'filetype-badtype', array ( 'parseinline' ),
 355                                 htmlspecialchars( $finalExt ), implode ( ', ', $wgFileExtensions ) ) );
 356                 }
 357
 358                 /**
 359                  * Look at the contents of the file; if we can recognize the
 360                  * type but it's corrupt or data of the wrong type, we should
 361                  * probably not accept it.
 362                  */
 363                 if( !$this->mStashed ) {
 364                         $this->mFileProps = File::getPropsFromPath( $this->mTempPath, $finalExt );
 365                         $this->checkMacBinary();
 366                         $veri = $this->verify( $this->mTempPath, $finalExt );
 367
 368                         if( $veri !== true ) { //it's a wiki error...
 369                                 return $this->uploadError( $veri->toString() );
 370                         }
 371
 372                         /**
 373                          * Provide an opportunity for extensions to add further checks
 374                          */
 375                         $error = '';
 376                         if( !wfRunHooks( 'UploadVerification',
 377                                         array( $this->mDestName, $this->mTempPath, &$error ) ) ) {
 378                                 return $this->uploadError( $error );
 379                         }
 380                 }
 381
 382
 383                 /**
 384                  * Check for non-fatal conditions
 385                  */
 386                 if ( ! $this->mIgnoreWarning ) {
 387                         $warning = '';
 388
 389                         global $wgCapitalLinks;
 390                         if( $wgCapitalLinks ) {
 391                                 $filtered = ucfirst( $filtered );
 392                         }
 393                         if( $basename != $filtered ) {
 394                                 $warning .=  '<li>'.wfMsgHtml( 'badfilename', htmlspecialchars( $this->mDestName ) ).'</li>';
 395                         }
 396
 397                         global $wgCheckFileExtensions;
 398                         if ( $wgCheckFileExtensions ) {
 399                                 if ( ! $this->checkFileExtension( $finalExt, $wgFileExtensions ) ) {
 400                                         $warning .= '<li>'.wfMsgExt( 'filetype-badtype', array ( 'parseinline' ),
 401                                                 htmlspecialchars( $finalExt ), implode ( ', ', $wgFileExtensions ) ).'</li>';
 402                                 }
 403                         }
 404
 405                         global $wgUploadSizeWarning;
 406                         if ( $wgUploadSizeWarning && ( $this->mFileSize > $wgUploadSizeWarning ) ) {
 407                                 $skin = $wgUser->getSkin();
 408                                 $wsize = $skin->formatSize( $wgUploadSizeWarning );
 409                                 $asize = $skin->formatSize( $this->mFileSize );
 410                                 $warning .= '<li>' . wfMsgHtml( 'large-file', $wsize, $asize ) . '</li>';
 411                         }
 412                         if ( $this->mFileSize == 0 ) {
 413                                 $warning .= '<li>'.wfMsgHtml( 'emptyfile' ).'</li>';
 414                         }
 415
 416                         if ( !$this->mDestWarningAck ) {
 417                                 $warning .= self::getExistsWarning( $this->mLocalFile );
 418                         }
 419                         if( $warning != '' ) {
 420                                 /**
 421                                  * Stash the file in a temporary location; the user can choose
 422                                  * to let it through and we'll complete the upload then.
 423                                  */
 424                                 return $this->uploadWarning( $warning );
 425                         }
 426                 }
 427
 428                 /**
 429                  * Try actually saving the thing...
 430                  * It will show an error form on failure.
 431                  */
 432                 $pageText = self::getInitialPageText( $this->mComment, $this->mLicense,
 433                         $this->mCopyrightStatus, $this->mCopyrightSource );
 434
 435                 $status = $this->mLocalFile->upload( $this->mTempPath, $this->mComment, $pageText,
 436                         File::DELETE_SOURCE, $this->mFileProps );
 437                 if ( !$status->isGood() ) {
 438                         $this->showError( $status->getWikiText() );
 439                 } else {
 440                         if ( $this->mWatchthis ) {
 441                                 global $wgUser;
 442                                 $wgUser->addWatch( $this->mLocalFile->getTitle() );
 443                         }
 444                         // Success, redirect to description page
 445                         $wgOut->redirect( $this->mLocalFile->getTitle()->getFullURL() );
 446                         $img = null; // @todo: added to avoid passing a ref to null - should this be defined somewhere?
 447                         wfRunHooks( 'UploadComplete', array( &$img ) );
 448                 }
 449         }
 450
 451         /**
 452          * Do existence checks on a file and produce a warning
 453          * This check is static and can be done pre-upload via AJAX
 454          * Returns an HTML fragment consisting of one or more LI elements if there is a warning
 455          * Returns an empty string if there is no warning
 456          */
 457         static function getExistsWarning( $file ) {
 458                 global $wgUser;
 459                 // Check for uppercase extension. We allow these filenames but check if an image
 460                 // with lowercase extension exists already
 461                 $warning = '';
 462                 $ext = $file->getExtension();
 463                 $sk = $wgUser->getSkin();
 464                 if ( $ext !== '' ) {
 465                         $partname = substr( $file->getName(), 0, -strlen( $ext ) - 1 );
 466                 } else {
 467                         $partname = $file->getName();
 468                 }
 469
 470                 if ( $ext != strtolower( $ext ) ) {
 471                         $nt_lc = Title::newFromText( $partname . '.' . strtolower( $ext ) );
 472                         $file_lc = wfLocalFile( $nt_lc );
 473                 } else {
 474                         $file_lc = false;
 475                 }
 476
 477                 if( $file->exists() ) {
 478                         $dlink = $sk->makeKnownLinkObj( $file->getTitle() );
 479                         if ( $file->allowInlineDisplay() ) {
 480                                 $dlink2 = $sk->makeImageLinkObj( $file->getTitle(), wfMsgExt( 'fileexists-thumb', 'parseinline', $dlink ),
 481                                         $file->getName(), 'right', array(), false, true );
 482                         } elseif ( !$file->allowInlineDisplay() && $file->isSafeFile() ) {
 483                                 $icon = $file->iconThumb();
 484                                 $dlink2 = '<div style="float:right" id="mw-media-icon"><a href="' . $file->getURL() . '">' .
 485                                         $icon->toHtml() . '</a><br />' . $dlink . '</div>';
 486                         } else {
 487                                 $dlink2 = '';
 488                         }
 489
 490                         $warning .= '<li>' . wfMsgExt( 'fileexists', 'parseline', $dlink ) . '</li>' . $dlink2;
 491
 492                 } elseif ( $file_lc && $file_lc->exists() ) {
 493                         # Check if image with lowercase extension exists.
 494                         # It's not forbidden but in 99% it makes no sense to upload the same filename with uppercase extension
 495                         $dlink = $sk->makeKnownLinkObj( $nt_lc );
 496                         if ( $file_lc->allowInlineDisplay() ) {
 497                                 $dlink2 = $sk->makeImageLinkObj( $nt_lc, wfMsgExt( 'fileexists-thumb', 'parseinline', $dlink ),
 498                                         $nt_lc->getText(), 'right', array(), false, true );
 499                         } elseif ( !$file_lc->allowInlineDisplay() && $file_lc->isSafeFile() ) {
 500                                 $icon = $file_lc->iconThumb();
 501                                 $dlink2 = '<div style="float:right" id="mw-media-icon"><a href="' . $file_lc->getURL() . '">' .
 502                                         $icon->toHtml() . '</a><br />' . $dlink . '</div>';
 503                         } else {
 504                                 $dlink2 = '';
 505                         }
 506
 507                         $warning .= '<li>' . wfMsgExt( 'fileexists-extension', 'parsemag' , $partname . '.'
 508                                 . $ext , $dlink ) . '</li>' . $dlink2;
 509
 510                 } elseif ( ( substr( $partname , 3, 3 ) == 'px-' || substr( $partname , 2, 3 ) == 'px-' )
 511                         && ereg( "[0-9]{2}" , substr( $partname , 0, 2) ) )
 512                 {
 513                         # Check for filenames like 50px- or 180px-, these are mostly thumbnails
 514                         $nt_thb = Title::newFromText( substr( $partname , strpos( $partname , '-' ) +1 ) . '.' . $ext );
 515                         $file_thb = wfLocalFile( $nt_thb );
 516                         if ($file_thb->exists() ) {
 517                                 # Check if an image without leading '180px-' (or similiar) exists
 518                                 $dlink = $sk->makeKnownLinkObj( $nt_thb);
 519                                 if ( $file_thb->allowInlineDisplay() ) {
 520                                         $dlink2 = $sk->makeImageLinkObj( $nt_thb,
 521                                                 wfMsgExt( 'fileexists-thumb', 'parseinline', $dlink ),
 522                                                 $nt_thb->getText(), 'right', array(), false, true );
 523                                 } elseif ( !$file_thb->allowInlineDisplay() && $file_thb->isSafeFile() ) {
 524                                         $icon = $file_thb->iconThumb();
 525                                         $dlink2 = '<div style="float:right" id="mw-media-icon"><a href="' .
 526                                                 $file_thb->getURL() . '">' . $icon->toHtml() . '</a><br />' .
 527                                                 $dlink . '</div>';
 528                                 } else {
 529                                         $dlink2 = '';
 530                                 }
 531
 532                                 $warning .= '<li>' . wfMsgExt( 'fileexists-thumbnail-yes', 'parsemag', $dlink ) .
 533                                         '</li>' . $dlink2;
 534                         } else {
 535                                 # Image w/o '180px-' does not exists, but we do not like these filenames
 536                                 $warning .= '<li>' . wfMsgExt( 'file-thumbnail-no', 'parseinline' ,
 537                                         substr( $partname , 0, strpos( $partname , '-' ) +1 ) ) . '</li>';
 538                         }
 539                 }
 540                 if ( $file->wasDeleted() ) {
 541                         # If the file existed before and was deleted, warn the user of this
 542                         # Don't bother doing so if the image exists now, however
 543                         $ltitle = SpecialPage::getTitleFor( 'Log' );
 544                         $llink = $sk->makeKnownLinkObj( $ltitle, wfMsgHtml( 'deletionlog' ),
 545                                 'type=delete&page=' . $file->getTitle()->getPrefixedUrl() );
 546                         $warning .= '<li>' . wfMsgWikiHtml( 'filewasdeleted', $llink ) . '</li>';
 547                 }
 548                 return $warning;
 549         }
 550
 551         static function ajaxGetExistsWarning( $filename ) {
 552                 $file = wfFindFile( $filename );
 553                 $s = '&nbsp;';
 554                 if ( $file ) {
 555                         $warning = self::getExistsWarning( $file );
 556                         if ( $warning !== '' ) {
 557                                 $s = "<ul>$warning</ul>";
 558                         }
 559                 }
 560                 return $s;
 561         }
 562
 563         /**
 564          * Render a preview of a given license for the AJAX preview on upload
 565          *
 566          * @param string $license
 567          * @return string
 568          */
 569         public static function ajaxGetLicensePreview( $license ) {
 570                 global $wgParser, $wgUser;
 571                 $text = '{{' . $license . '}}';
 572                 $title = Title::makeTitle( NS_IMAGE, 'Sample.jpg' );
 573                 $options = ParserOptions::newFromUser( $wgUser );
 574
 575                 // Expand subst: first, then live templates...
 576                 $text = $wgParser->preSaveTransform( $text, $title, $wgUser, $options );
 577                 $output = $wgParser->parse( $text, $title, $options );
 578
 579                 return $output->getText();
 580         }
 581
 582         /**
 583          * Stash a file in a temporary directory for later processing
 584          * after the user has confirmed it.
 585          *
 586          * If the user doesn't explicitly cancel or accept, these files
 587          * can accumulate in the temp directory.
 588          *
 589          * @param string $saveName - the destination filename
 590          * @param string $tempName - the source temporary file to save
 591          * @return string - full path the stashed file, or false on failure
 592          * @access private
 593          */
 594         function saveTempUploadedFile( $saveName, $tempName ) {
 595                 global $wgOut;
 596                 $repo = RepoGroup::singleton()->getLocalRepo();
 597                 $status = $repo->storeTemp( $saveName, $tempName );
 598                 if ( !$status->isGood() ) {
 599                         $this->showError( $status->getWikiText() );
 600                         return false;
 601                 } else {
 602                         return $status->value;
 603                 }
 604         }
 605
 606         /**
 607          * Stash a file in a temporary directory for later processing,
 608          * and save the necessary descriptive info into the session.
 609          * Returns a key value which will be passed through a form
 610          * to pick up the path info on a later invocation.
 611          *
 612          * @return int
 613          * @access private
 614          */
 615         function stashSession() {
 616                 $stash = $this->saveTempUploadedFile( $this->mDestName, $this->mTempPath );
 617
 618                 if( !$stash ) {
 619                         # Couldn't save the file.
 620                         return false;
 621                 }
 622
 623                 $key = mt_rand( 0, 0x7fffffff );
 624                 $_SESSION['wsUploadData'][$key] = array(
 625                         'mTempPath'       => $stash,
 626                         'mFileSize'       => $this->mFileSize,
 627                         'mSrcName'        => $this->mSrcName,
 628                         'mFileProps'      => $this->mFileProps,
 629                         'version'         => self::SESSION_VERSION,
 630                 );
 631                 return $key;
 632         }
 633
 634         /**
 635          * Remove a temporarily kept file stashed by saveTempUploadedFile().
 636          * @access private
 637          * @return success
 638          */
 639         function unsaveUploadedFile() {
 640                 global $wgOut;
 641                 $repo = RepoGroup::singleton()->getLocalRepo();
 642                 $success = $repo->freeTemp( $this->mTempPath );
 643                 if ( ! $success ) {
 644                         $wgOut->showFileDeleteError( $this->mTempPath );
 645                         return false;
 646                 } else {
 647                         return true;
 648                 }
 649         }
 650
 651         /* -------------------------------------------------------------- */
 652
 653         /**
 654          * @param string $error as HTML
 655          * @access private
 656          */
 657         function uploadError( $error ) {
 658                 global $wgOut;
 659                 $wgOut->addHTML( "<h2>" . wfMsgHtml( 'uploadwarning' ) . "</h2>\n" );
 660                 $wgOut->addHTML( "<span class='error'>{$error}</span>\n" );
 661         }
 662
 663         /**
 664          * There's something wrong with this file, not enough to reject it
 665          * totally but we require manual intervention to save it for real.
 666          * Stash it away, then present a form asking to confirm or cancel.
 667          *
 668          * @param string $warning as HTML
 669          * @access private
 670          */
 671         function uploadWarning( $warning ) {
 672                 global $wgOut, $wgContLang;
 673                 global $wgUseCopyrightUpload;
 674
 675                 $this->mSessionKey = $this->stashSession();
 676                 if( !$this->mSessionKey ) {
 677                         # Couldn't save file; an error has been displayed so let's go.
 678                         return;
 679                 }
 680
 681                 $wgOut->addHTML( "<h2>" . wfMsgHtml( 'uploadwarning' ) . "</h2>\n" );
 682                 $wgOut->addHTML( "<ul class='warning'>{$warning}</ul><br />\n" );
 683
 684                 $save = wfMsgHtml( 'savefile' );
 685                 $reupload = wfMsgHtml( 'reupload' );
 686                 $iw = wfMsgWikiHtml( 'ignorewarning' );
 687                 $reup = wfMsgWikiHtml( 'reuploaddesc' );
 688                 $titleObj = SpecialPage::getTitleFor( 'Upload' );
 689                 $action = $titleObj->escapeLocalURL( 'action=submit' );
 690                 $align1 = $wgContLang->isRTL() ? 'left' : 'right';
 691                 $align2 = $wgContLang->isRTL() ? 'right' : 'left';
 692
 693                 if ( $wgUseCopyrightUpload )
 694                 {
 695                         $copyright =  "
 696         <input type='hidden' name='wpUploadCopyStatus' value=\"" . htmlspecialchars( $this->mCopyrightStatus ) . "\" />
 697         <input type='hidden' name='wpUploadSource' value=\"" . htmlspecialchars( $this->mCopyrightSource ) . "\" />
 698         ";
 699                 } else {
 700                         $copyright = "";
 701                 }
 702
 703                 $wgOut->addHTML( "
 704         <form id='uploadwarning' method='post' enctype='multipart/form-data' action='$action'>
 705                 <input type='hidden' name='wpIgnoreWarning' value='1' />
 706                 <input type='hidden' name='wpSessionKey' value=\"" . htmlspecialchars( $this->mSessionKey ) . "\" />
 707                 <input type='hidden' name='wpUploadDescription' value=\"" . htmlspecialchars( $this->mComment ) . "\" />
 708                 <input type='hidden' name='wpLicense' value=\"" . htmlspecialchars( $this->mLicense ) . "\" />
 709                 <input type='hidden' name='wpDestFile' value=\"" . htmlspecialchars( $this->mDesiredDestName ) . "\" />
 710                 <input type='hidden' name='wpWatchthis' value=\"" . htmlspecialchars( intval( $this->mWatchthis ) ) . "\" />
 711         {$copyright}
 712         <table border='0'>
 713                 <tr>
 714                         <tr>
 715                                 <td align='$align1'>
 716                                         <input tabindex='2' type='submit' name='wpUpload' value=\"$save\" />
 717                                 </td>
 718                                 <td align='$align2'>$iw</td>
 719                         </tr>
 720                         <tr>
 721                                 <td align='$align1'>
 722                                         <input tabindex='2' type='submit' name='wpReUpload' value=\"{$reupload}\" />
 723                                 </td>
 724                                 <td align='$align2'>$reup</td>
 725                         </tr>
 726                 </tr>
 727         </table></form>\n" );
 728         }
 729
 730         /**
 731          * Displays the main upload form, optionally with a highlighted
 732          * error message up at the top.
 733          *
 734          * @param string $msg as HTML
 735          * @access private
 736          */
 737         function mainUploadForm( $msg='' ) {
 738                 global $wgOut, $wgUser, $wgContLang;
 739                 global $wgUseCopyrightUpload, $wgUseAjax, $wgAjaxUploadDestCheck, $wgAjaxLicensePreview;
 740                 global $wgRequest, $wgAllowCopyUploads;
 741                 global $wgStylePath, $wgStyleVersion;
 742
 743                 $useAjaxDestCheck = $wgUseAjax && $wgAjaxUploadDestCheck;
 744                 $useAjaxLicensePreview = $wgUseAjax && $wgAjaxLicensePreview;
 745
 746                 $adc = wfBoolToStr( $useAjaxDestCheck );
 747                 $alp = wfBoolToStr( $useAjaxLicensePreview );
 748
 749                 $wgOut->addScript( "<script type=\"text/javascript\">
 750 wgAjaxUploadDestCheck = {$adc};
 751 wgAjaxLicensePreview = {$alp};
 752 </script>
 753 <script type=\"text/javascript\" src=\"{$wgStylePath}/common/upload.js?{$wgStyleVersion}\"></script>
 754                 " );
 755
 756                 if( !wfRunHooks( 'UploadForm:initial', array( &$this ) ) )
 757                 {
 758                         wfDebug( "Hook 'UploadForm:initial' broke output of the upload form" );
 759                         return false;
 760                 }
 761
 762                 if( $this->mDesiredDestName && $wgUser->isAllowed( 'deletedhistory' ) ) {
 763                         $title = Title::makeTitleSafe( NS_IMAGE, $this->mDesiredDestName );
 764                         if( $title instanceof Title && ( $count = $title->isDeleted() ) > 0 ) {
 765                                 $link = wfMsgExt(
 766                                         $wgUser->isAllowed( 'delete' ) ? 'thisisdeleted' : 'viewdeleted',
 767                                         array( 'parse', 'replaceafter' ),
 768                                         $wgUser->getSkin()->makeKnownLinkObj(
 769                                                 SpecialPage::getTitleFor( 'Undelete', $title->getPrefixedText() ),
 770                                                 wfMsgHtml( 'restorelink', $count )
 771                                         )
 772                                 );
 773                                 $wgOut->addHtml( "<div id=\"contentSub2\">{$link}</div>" );
 774                         }
 775                 }
 776
 777                 $cols = intval($wgUser->getOption( 'cols' ));
 778                 $ew = $wgUser->getOption( 'editwidth' );
 779                 if ( $ew ) $ew = " style=\"width:100%\"";
 780                 else $ew = '';
 781
 782                 if ( '' != $msg ) {
 783                         $sub = wfMsgHtml( 'uploaderror' );
 784                         $wgOut->addHTML( "<h2>{$sub}</h2>\n" .
 785                           "<span class='error'>{$msg}</span>\n" );
 786                 }
 787                 $wgOut->addHTML( '<div id="uploadtext">' );
 788                 $wgOut->addWikiText( wfMsgNoTrans( 'uploadtext', $this->mDesiredDestName ) );
 789                 $wgOut->addHTML( '</div>' );
 790
 791                 $sourcefilename = wfMsgHtml( 'sourcefilename' );
 792                 $destfilename = wfMsgHtml( 'destfilename' );
 793                 $summary = wfMsgExt( 'fileuploadsummary', 'parseinline' );
 794
 795                 $licenses = new Licenses();
 796                 $license = wfMsgExt( 'license', array( 'parseinline' ) );
 797                 $nolicense = wfMsgHtml( 'nolicense' );
 798                 $licenseshtml = $licenses->getHtml();
 799
 800                 $ulb = wfMsgHtml( 'uploadbtn' );
 801                 $ulbKey = wfMsgHtml( 'accesskey-upload' );
 802                 $ulbTip = wfMsgHtml( 'tooltip-upload' ) .' ['.wfMsg( 'accesskey-upload' ) . ']';
 803
 804
 805                 $titleObj = SpecialPage::getTitleFor( 'Upload' );
 806                 $action = $titleObj->escapeLocalURL();
 807
 808                 $encDestName = htmlspecialchars( $this->mDesiredDestName );
 809
 810                 $watchChecked =
 811                         ( $wgUser->getOption( 'watchdefault' ) ||
 812                                 ( $wgUser->getOption( 'watchcreations' ) && $this->mDesiredDestName == '' ) )
 813                         ? 'checked="checked"'
 814                         : '';
 815                 $warningChecked = $this->mIgnoreWarning ? 'checked' : '';
 816
 817                 // Prepare form for upload or upload/copy
 818                 if( $wgAllowCopyUploads && $wgUser->isAllowed( 'upload_by_url' ) ) {
 819                         $filename_form =
 820                                 "<input type='radio' id='wpSourceTypeFile' name='wpSourceType' value='file' " .
 821                                    "onchange='toggle_element_activation(\"wpUploadFileURL\",\"wpUploadFile\")' checked />" .
 822                                  "<input tabindex='1' type='file' name='wpUploadFile' id='wpUploadFile' " .
 823                                    "onfocus='" .
 824                                      "toggle_element_activation(\"wpUploadFileURL\",\"wpUploadFile\");" .
 825                                      "toggle_element_check(\"wpSourceTypeFile\",\"wpSourceTypeURL\")'" .
 826                                 ($this->mDesiredDestName?"":"onchange='fillDestFilename(\"wpUploadFile\")' ") . "size='40' />" .
 827                                 wfMsgHTML( 'upload_source_file' ) . "<br/>" .
 828                                 "<input type='radio' id='wpSourceTypeURL' name='wpSourceType' value='web' " .
 829                                   "onchange='toggle_element_activation(\"wpUploadFile\",\"wpUploadFileURL\")' />" .
 830                                 "<input tabindex='1' type='text' name='wpUploadFileURL' id='wpUploadFileURL' " .
 831                                   "onfocus='" .
 832                                     "toggle_element_activation(\"wpUploadFile\",\"wpUploadFileURL\");" .
 833                                     "toggle_element_check(\"wpSourceTypeURL\",\"wpSourceTypeFile\")'" .
 834                                 ($this->mDesiredDestName?"":"onchange='fillDestFilename(\"wpUploadFileURL\")' ") . "size='40' DISABLED />" .
 835                                 wfMsgHtml( 'upload_source_url' ) ;
 836                 } else {
 837                         $filename_form =
 838                                 "<input tabindex='1' type='file' name='wpUploadFile' id='wpUploadFile' " .
 839                                 ($this->mDesiredDestName?"":"onchange='fillDestFilename(\"wpUploadFile\")' ") .
 840                                 "size='40' />" .
 841                                 "<input type='hidden' name='wpSourceType' value='file' />" ;
 842                 }
 843                 if ( $useAjaxDestCheck ) {
 844                         $warningRow = "<tr><td colspan='2' id='wpDestFile-warning'>&nbsp;</td></tr>";
 845                         $destOnkeyup = 'onkeyup="wgUploadWarningObj.keypress();"';
 846                 } else {
 847                         $warningRow = '';
 848                         $destOnkeyup = '';
 849                 }
 850
 851                 $encComment = htmlspecialchars( $this->mComment );
 852                 $align1 = $wgContLang->isRTL() ? 'left' : 'right';
 853                 $align2 = $wgContLang->isRTL() ? 'right' : 'left';
 854
 855                 $wgOut->addHTML( <<<EOT
 856         <form id='upload' method='post' enctype='multipart/form-data' action="$action">
 857                 <table border='0'>
 858                 <tr>
 859           {$this->uploadFormTextTop}
 860                         <td align='$align1' valign='top'><label for='wpUploadFile'>{$sourcefilename}:</label></td>
 861                         <td align='$align2'>
 862                                 {$filename_form}
 863                         </td>
 864                 </tr>
 865                 <tr>
 866                         <td align='$align1'><label for='wpDestFile'>{$destfilename}:</label></td>
 867                         <td align='$align2'>
 868                                 <input tabindex='2' type='text' name='wpDestFile' id='wpDestFile' size='40'
 869                                         value="$encDestName" $destOnkeyup />
 870                         </td>
 871                 </tr>
 872                 <tr>
 873                         <td align='$align1'><label for='wpUploadDescription'>{$summary}</label></td>
 874                         <td align='$align2'>
 875                                 <textarea tabindex='3' name='wpUploadDescription' id='wpUploadDescription' rows='6'
 876                                         cols='{$cols}'{$ew}>$encComment</textarea>
 877            {$this->uploadFormTextAfterSummary}
 878                         </td>
 879                 </tr>
 880                 <tr>
 881 EOT
 882                 );
 883
 884                 if ( $licenseshtml != '' ) {
 885                         global $wgStylePath;
 886                         $wgOut->addHTML( "
 887                         <td align='$align1'><label for='wpLicense'>$license:</label></td>
 888                         <td align='$align2'>
 889                                 <select name='wpLicense' id='wpLicense' tabindex='4'
 890                                         onchange='licenseSelectorCheck()'>
 891                                         <option value=''>$nolicense</option>
 892                                         $licenseshtml
 893                                 </select>
 894                         </td>
 895                         </tr>
 896                         <tr>" );
 897                         if( $useAjaxLicensePreview ) {
 898                                 $wgOut->addHtml( "
 899                                         <td></td>
 900                                         <td id=\"mw-license-preview\"></td>
 901                                 </tr>
 902                                 <tr>" );
 903                         }
 904                 }
 905
 906                 if ( $wgUseCopyrightUpload ) {
 907                         $filestatus = wfMsgHtml ( 'filestatus' );
 908                         $copystatus =  htmlspecialchars( $this->mCopyrightStatus );
 909                         $filesource = wfMsgHtml ( 'filesource' );
 910                         $uploadsource = htmlspecialchars( $this->mCopyrightSource );
 911
 912                         $wgOut->addHTML( "
 913                                 <td align='$align1' nowrap='nowrap'><label for='wpUploadCopyStatus'>$filestatus:</label></td>
 914                                         <td><input tabindex='5' type='text' name='wpUploadCopyStatus' id='wpUploadCopyStatus'
 915                                           value=\"$copystatus\" size='40' /></td>
 916                         </tr>
 917                         <tr>
 918                                 <td align='$align1'><label for='wpUploadCopyStatus'>$filesource:</label></td>
 919                                         <td><input tabindex='6' type='text' name='wpUploadSource' id='wpUploadCopyStatus'
 920                                           value=\"$uploadsource\" size='40' /></td>
 921                         </tr>
 922                         <tr>
 923                 ");
 924                 }
 925
 926                 $wgOut->addHtml( "
 927                 <td></td>
 928                 <td>
 929                         <input tabindex='7' type='checkbox' name='wpWatchthis' id='wpWatchthis' $watchChecked value='true' />
 930                         <label for='wpWatchthis'>" . wfMsgHtml( 'watchthisupload' ) . "</label>
 931                         <input tabindex='8' type='checkbox' name='wpIgnoreWarning' id='wpIgnoreWarning' value='true' $warningChecked/>
 932                         <label for='wpIgnoreWarning'>" . wfMsgHtml( 'ignorewarnings' ) . "</label>
 933                 </td>
 934         </tr>
 935         $warningRow
 936         <tr>
 937                 <td></td>
 938                 <td align='$align2'><input tabindex='9' type='submit' name='wpUpload' value=\"{$ulb}\" title=\"{$ulbTip}\" accesskey=\"{$ulbKey}\" /></td>
 939         </tr>
 940         <tr>
 941                 <td></td>
 942                 <td align='$align2'>
 943                 " );
 944                 $wgOut->addWikiText( wfMsgForContent( 'edittools' ) );
 945                 $wgOut->addHTML( "
 946                 </td>
 947         </tr>
 948
 949         </table>
 950         <input type='hidden' name='wpDestFileWarningAck' id='wpDestFileWarningAck' value=''/>
 951         </form>" );
 952         }
 953
 954         /* -------------------------------------------------------------- */
 955
 956         /**
 957          * Split a file into a base name and all dot-delimited 'extensions'
 958          * on the end. Some web server configurations will fall back to
 959          * earlier pseudo-'extensions' to determine type and execute
 960          * scripts, so the blacklist needs to check them all.
 961          *
 962          * @return array
 963          */
 964         function splitExtensions( $filename ) {
 965                 $bits = explode( '.', $filename );
 966                 $basename = array_shift( $bits );
 967                 return array( $basename, $bits );
 968         }
 969
 970         /**
 971          * Perform case-insensitive match against a list of file extensions.
 972          * Returns true if the extension is in the list.
 973          *
 974          * @param string $ext
 975          * @param array $list
 976          * @return bool
 977          */
 978         function checkFileExtension( $ext, $list ) {
 979                 return in_array( strtolower( $ext ), $list );
 980         }
 981
 982         /**
 983          * Perform case-insensitive match against a list of file extensions.
 984          * Returns true if any of the extensions are in the list.
 985          *
 986          * @param array $ext
 987          * @param array $list
 988          * @return bool
 989          */
 990         function checkFileExtensionList( $ext, $list ) {
 991                 foreach( $ext as $e ) {
 992                         if( in_array( strtolower( $e ), $list ) ) {
 993                                 return true;
 994                         }
 995                 }
 996                 return false;
 997         }
 998
 999         /**
1000          * Verifies that it's ok to include the uploaded file
1001          *
1002          * @param string $tmpfile the full path of the temporary file to verify
1003          * @param string $extension The filename extension that the file is to be served with
1004          * @return mixed true of the file is verified, a WikiError object otherwise.
1005          */
1006         function verify( $tmpfile, $extension ) {
1007                 #magically determine mime type
1008                 $magic=& MimeMagic::singleton();
1009                 $mime= $magic->guessMimeType($tmpfile,false);
1010
1011                 #check mime type, if desired
1012                 global $wgVerifyMimeType;
1013                 if ($wgVerifyMimeType) {
1014
1015                   wfDebug ( "\n\nmime: <$mime> extension: <$extension>\n\n");
1016                         #check mime type against file extension
1017                         if( !$this->verifyExtension( $mime, $extension ) ) {
1018                                 return new WikiErrorMsg( 'uploadcorrupt' );
1019                         }
1020
1021                         #check mime type blacklist
1022                         global $wgMimeTypeBlacklist;
1023                         if( isset($wgMimeTypeBlacklist) && !is_null($wgMimeTypeBlacklist)
1024                                 && $this->checkFileExtension( $mime, $wgMimeTypeBlacklist ) ) {
1025                                 return new WikiErrorMsg( 'filetype-badmime', htmlspecialchars( $mime ) );
1026                         }
1027                 }
1028
1029                 #check for htmlish code and javascript
1030                 if( $this->detectScript ( $tmpfile, $mime, $extension ) ) {
1031                         return new WikiErrorMsg( 'uploadscripted' );
1032                 }
1033
1034                 /**
1035                 * Scan the uploaded file for viruses
1036                 */
1037                 $virus= $this->detectVirus($tmpfile);
1038                 if ( $virus ) {
1039                         return new WikiErrorMsg( 'uploadvirus', htmlspecialchars($virus) );
1040                 }
1041
1042                 wfDebug( __METHOD__.": all clear; passing.\n" );
1043                 return true;
1044         }
1045
1046         /**
1047          * Checks if the mime type of the uploaded file matches the file extension.
1048          *
1049          * @param string $mime the mime type of the uploaded file
1050          * @param string $extension The filename extension that the file is to be served with
1051          * @return bool
1052          */
1053         function verifyExtension( $mime, $extension ) {
1054                 $magic =& MimeMagic::singleton();
1055
1056                 if ( ! $mime || $mime == 'unknown' || $mime == 'unknown/unknown' )
1057                         if ( ! $magic->isRecognizableExtension( $extension ) ) {
1058                                 wfDebug( __METHOD__.": passing file with unknown detected mime type; " .
1059                                         "unrecognized extension '$extension', can't verify\n" );
1060                                 return true;
1061                         } else {
1062                                 wfDebug( __METHOD__.": rejecting file with unknown detected mime type; ".
1063                                         "recognized extension '$extension', so probably invalid file\n" );
1064                                 return false;
1065                         }
1066
1067                 $match= $magic->isMatchingExtension($extension,$mime);
1068
1069                 if ($match===NULL) {
1070                         wfDebug( __METHOD__.": no file extension known for mime type $mime, passing file\n" );
1071                         return true;
1072                 } elseif ($match===true) {
1073                         wfDebug( __METHOD__.": mime type $mime matches extension $extension, passing file\n" );
1074
1075                         #TODO: if it's a bitmap, make sure PHP or ImageMagic resp. can handle it!
1076                         return true;
1077
1078                 } else {
1079                         wfDebug( __METHOD__.": mime type $mime mismatches file extension $extension, rejecting file\n" );
1080                         return false;
1081                 }
1082         }
1083
1084         /**
1085          * Heuristic for detecting files that *could* contain JavaScript instructions or
1086          * things that may look like HTML to a browser and are thus
1087          * potentially harmful. The present implementation will produce false positives in some situations.
1088          *
1089          * @param string $file Pathname to the temporary upload file
1090          * @param string $mime The mime type of the file
1091          * @param string $extension The extension of the file
1092          * @return bool true if the file contains something looking like embedded scripts
1093          */
1094         function detectScript($file, $mime, $extension) {
1095                 global $wgAllowTitlesInSVG;
1096
1097                 #ugly hack: for text files, always look at the entire file.
1098                 #For binarie field, just check the first K.
1099
1100                 if (strpos($mime,'text/')===0) $chunk = file_get_contents( $file );
1101                 else {
1102                         $fp = fopen( $file, 'rb' );
1103                         $chunk = fread( $fp, 1024 );
1104                         fclose( $fp );
1105                 }
1106
1107                 $chunk= strtolower( $chunk );
1108
1109                 if (!$chunk) return false;
1110
1111                 #decode from UTF-16 if needed (could be used for obfuscation).
1112                 if (substr($chunk,0,2)=="\xfe\xff") $enc= "UTF-16BE";
1113                 elseif (substr($chunk,0,2)=="\xff\xfe") $enc= "UTF-16LE";
1114                 else $enc= NULL;
1115
1116                 if ($enc) $chunk= iconv($enc,"ASCII//IGNORE",$chunk);
1117
1118                 $chunk= trim($chunk);
1119
1120                 #FIXME: convert from UTF-16 if necessarry!
1121
1122                 wfDebug("SpecialUpload::detectScript: checking for embedded scripts and HTML stuff\n");
1123
1124                 #check for HTML doctype
1125                 if (eregi("<!DOCTYPE *X?HTML",$chunk)) return true;
1126
1127                 /**
1128                 * Internet Explorer for Windows performs some really stupid file type
1129                 * autodetection which can cause it to interpret valid image files as HTML
1130                 * and potentially execute JavaScript, creating a cross-site scripting
1131                 * attack vectors.
1132                 *
1133                 * Apple's Safari browser also performs some unsafe file type autodetection
1134                 * which can cause legitimate files to be interpreted as HTML if the
1135                 * web server is not correctly configured to send the right content-type
1136                 * (or if you're really uploading plain text and octet streams!)
1137                 *
1138                 * Returns true if IE is likely to mistake the given file for HTML.
1139                 * Also returns true if Safari would mistake the given file for HTML
1140                 * when served with a generic content-type.
1141                 */
1142
1143                 $tags = array(
1144                         '<body',
1145                         '<head',
1146                         '<html',   #also in safari
1147                         '<img',
1148                         '<pre',
1149                         '<script', #also in safari
1150                         '<table'
1151                         );
1152                 if( ! $wgAllowTitlesInSVG && $extension !== 'svg' && $mime !== 'image/svg' ) {
1153                         $tags[] = '<title';
1154                 }
1155
1156                 foreach( $tags as $tag ) {
1157                         if( false !== strpos( $chunk, $tag ) ) {
1158                                 return true;
1159                         }
1160                 }
1161
1162                 /*
1163                 * look for javascript
1164                 */
1165
1166                 #resolve entity-refs to look at attributes. may be harsh on big files... cache result?
1167                 $chunk = Sanitizer::decodeCharReferences( $chunk );
1168
1169                 #look for script-types
1170                 if (preg_match('!type\s*=\s*[\'"]?\s*(?:\w*/)?(?:ecma|java)!sim',$chunk)) return true;
1171
1172                 #look for html-style script-urls
1173                 if (preg_match('!(?:href|src|data)\s*=\s*[\'"]?\s*(?:ecma|java)script:!sim',$chunk)) return true;
1174
1175                 #look for css-style script-urls
1176                 if (preg_match('!url\s*\(\s*[\'"]?\s*(?:ecma|java)script:!sim',$chunk)) return true;
1177
1178                 wfDebug("SpecialUpload::detectScript: no scripts found\n");
1179                 return false;
1180         }
1181
1182         /**
1183          * Generic wrapper function for a virus scanner program.
1184          * This relies on the $wgAntivirus and $wgAntivirusSetup variables.
1185          * $wgAntivirusRequired may be used to deny upload if the scan fails.
1186          *
1187          * @param string $file Pathname to the temporary upload file
1188          * @return mixed false if not virus is found, NULL if the scan fails or is disabled,
1189          *         or a string containing feedback from the virus scanner if a virus was found.
1190          *         If textual feedback is missing but a virus was found, this function returns true.
1191          */
1192         function detectVirus($file) {
1193                 global $wgAntivirus, $wgAntivirusSetup, $wgAntivirusRequired, $wgOut;
1194
1195                 if ( !$wgAntivirus ) {
1196                         wfDebug( __METHOD__.": virus scanner disabled\n");
1197                         return NULL;
1198                 }
1199
1200                 if ( !$wgAntivirusSetup[$wgAntivirus] ) {
1201                         wfDebug( __METHOD__.": unknown virus scanner: $wgAntivirus\n" );
1202                         # @TODO: localise
1203                         $wgOut->addHTML( "<div class='error'>Bad configuration: unknown virus scanner: <i>$wgAntivirus</i></div>\n" );
1204                         return "unknown antivirus: $wgAntivirus";
1205                 }
1206
1207                 # look up scanner configuration
1208                 $command = $wgAntivirusSetup[$wgAntivirus]["command"];
1209                 $exitCodeMap = $wgAntivirusSetup[$wgAntivirus]["codemap"];
1210                 $msgPattern = isset( $wgAntivirusSetup[$wgAntivirus]["messagepattern"] ) ?
1211                         $wgAntivirusSetup[$wgAntivirus]["messagepattern"] : null;
1212
1213                 if ( strpos( $command,"%f" ) === false ) {
1214                         # simple pattern: append file to scan
1215                         $command .= " " . wfEscapeShellArg( $file );
1216                 } else {
1217                         # complex pattern: replace "%f" with file to scan
1218                         $command = str_replace( "%f", wfEscapeShellArg( $file ), $command );
1219                 }
1220
1221                 wfDebug( __METHOD__.": running virus scan: $command \n" );
1222
1223                 # execute virus scanner
1224                 $exitCode = false;
1225
1226                 #NOTE: there's a 50 line workaround to make stderr redirection work on windows, too.
1227                 #      that does not seem to be worth the pain.
1228                 #      Ask me (Duesentrieb) about it if it's ever needed.
1229                 $output = array();
1230                 if ( wfIsWindows() ) {
1231                         exec( "$command", $output, $exitCode );
1232                 } else {
1233                         exec( "$command 2>&1", $output, $exitCode );
1234                 }
1235
1236                 # map exit code to AV_xxx constants.
1237                 $mappedCode = $exitCode;
1238                 if ( $exitCodeMap ) {
1239                         if ( isset( $exitCodeMap[$exitCode] ) ) {
1240                                 $mappedCode = $exitCodeMap[$exitCode];
1241                         } elseif ( isset( $exitCodeMap["*"] ) ) {
1242                                 $mappedCode = $exitCodeMap["*"];
1243                         }
1244                 }
1245
1246                 if ( $mappedCode === AV_SCAN_FAILED ) {
1247                         # scan failed (code was mapped to false by $exitCodeMap)
1248                         wfDebug( __METHOD__.": failed to scan $file (code $exitCode).\n" );
1249
1250                         if ( $wgAntivirusRequired ) {
1251                                 return "scan failed (code $exitCode)";
1252                         } else {
1253                                 return NULL;
1254                         }
1255                 } else if ( $mappedCode === AV_SCAN_ABORTED ) {
1256                         # scan failed because filetype is unknown (probably imune)
1257                         wfDebug( __METHOD__.": unsupported file type $file (code $exitCode).\n" );
1258                         return NULL;
1259                 } else if ( $mappedCode === AV_NO_VIRUS ) {
1260                         # no virus found
1261                         wfDebug( __METHOD__.": file passed virus scan.\n" );
1262                         return false;
1263                 } else {
1264                         $output = join( "\n", $output );
1265                         $output = trim( $output );
1266
1267                         if ( !$output ) {
1268                                 $output = true; #if there's no output, return true
1269                         } elseif ( $msgPattern ) {
1270                                 $groups = array();
1271                                 if ( preg_match( $msgPattern, $output, $groups ) ) {
1272                                         if ( $groups[1] ) {
1273                                                 $output = $groups[1];
1274                                         }
1275                                 }
1276                         }
1277
1278                         wfDebug( __METHOD__.": FOUND VIRUS! scanner feedback: $output" );
1279                         return $output;
1280                 }
1281         }
1282
1283         /**
1284          * Check if the temporary file is MacBinary-encoded, as some uploads
1285          * from Internet Explorer on Mac OS Classic and Mac OS X will be.
1286          * If so, the data fork will be extracted to a second temporary file,
1287          * which will then be checked for validity and either kept or discarded.
1288          *
1289          * @access private
1290          */
1291         function checkMacBinary() {
1292                 $macbin = new MacBinary( $this->mTempPath );
1293                 if( $macbin->isValid() ) {
1294                         $dataFile = tempnam( wfTempDir(), "WikiMacBinary" );
1295                         $dataHandle = fopen( $dataFile, 'wb' );
1296
1297                         wfDebug( "SpecialUpload::checkMacBinary: Extracting MacBinary data fork to $dataFile\n" );
1298                         $macbin->extractData( $dataHandle );
1299
1300                         $this->mTempPath = $dataFile;
1301                         $this->mFileSize = $macbin->dataForkLength();
1302
1303                         // We'll have to manually remove the new file if it's not kept.
1304                         $this->mRemoveTempFile = true;
1305                 }
1306                 $macbin->close();
1307         }
1308
1309         /**
1310          * If we've modified the upload file we need to manually remove it
1311          * on exit to clean up.
1312          * @access private
1313          */
1314         function cleanupTempFile() {
1315                 if ( $this->mRemoveTempFile && file_exists( $this->mTempPath ) ) {
1316                         wfDebug( "SpecialUpload::cleanupTempFile: Removing temporary file {$this->mTempPath}\n" );
1317                         unlink( $this->mTempPath );
1318                 }
1319         }
1320
1321         /**
1322          * Check if there's an overwrite conflict and, if so, if restrictions
1323          * forbid this user from performing the upload.
1324          *
1325          * @return mixed true on success, WikiError on failure
1326          * @access private
1327          */
1328         function checkOverwrite( $name ) {
1329                 $img = wfFindFile( $name );
1330
1331                 $error = '';
1332                 if( $img ) {
1333                         global $wgUser, $wgOut;
1334                         if( $img->isLocal() ) {
1335                                 if( !self::userCanReUpload( $wgUser, $img->name ) ) {
1336                                         $error = 'fileexists-forbidden';
1337                                 }
1338                         } else {
1339                                 if( !$wgUser->isAllowed( 'reupload' ) ||
1340                                     !$wgUser->isAllowed( 'reupload-shared' ) ) {
1341                                         $error = "fileexists-shared-forbidden";
1342                                 }
1343                         }
1344                 }
1345
1346                 if( $error ) {
1347                         $errorText = wfMsg( $error, wfEscapeWikiText( $img->getName() ) );
1348                         return new WikiError( $wgOut->parse( $errorText ) );
1349                 }
1350
1351                 // Rockin', go ahead and upload
1352                 return true;
1353         }
1354
1355          /**
1356          * Check if a user is the last uploader
1357          *
1358          * @param User $user
1359          * @param string $img, image name
1360          * @return bool
1361          */
1362         public static function userCanReUpload( User $user, $img ) {
1363                 if( $user->isAllowed( 'reupload' ) )
1364                         return true; // non-conditional
1365                 if( !$user->isAllowed( 'reupload-own' ) )
1366                         return false;
1367
1368                 $dbr = wfGetDB( DB_SLAVE );
1369                 $row = $dbr->selectRow('image',
1370                 /* SELECT */ 'img_user',
1371                 /* WHERE */ array( 'img_name' => $img )
1372                 );
1373                 if ( !$row )
1374                         return false;
1375
1376                 return $user->getID() == $row->img_user;
1377         }
1378
1379         /**
1380          * Display an error with a wikitext description
1381          */
1382         function showError( $description ) {
1383                 global $wgOut;
1384                 $wgOut->setPageTitle( wfMsg( "internalerror" ) );
1385                 $wgOut->setRobotpolicy( "noindex,nofollow" );
1386                 $wgOut->setArticleRelated( false );
1387                 $wgOut->enableClientCache( false );
1388                 $wgOut->addWikiText( $description );
1389         }
1390
1391         /**
1392          * Get the initial image page text based on a comment and optional file status information
1393          */
1394         static function getInitialPageText( $comment, $license, $copyStatus, $source ) {
1395                 global $wgUseCopyrightUpload;
1396                 if ( $wgUseCopyrightUpload ) {
1397                         if ( $license != '' ) {
1398                                 $licensetxt = '== ' . wfMsgForContent( 'license' ) . " ==\n" . '{{' . $license . '}}' . "\n";
1399                         }
1400                         $pageText = '== ' . wfMsg ( 'filedesc' ) . " ==\n" . $comment . "\n" .
1401                           '== ' . wfMsgForContent ( 'filestatus' ) . " ==\n" . $copyStatus . "\n" .
1402                           "$licensetxt" .
1403                           '== ' . wfMsgForContent ( 'filesource' ) . " ==\n" . $source ;
1404                 } else {
1405                         if ( $license != '' ) {
1406                                 $filedesc = $comment == '' ? '' : '== ' . wfMsg ( 'filedesc' ) . " ==\n" . $comment . "\n";
1407                                  $pageText = $filedesc .
1408                                          '== ' . wfMsgForContent ( 'license' ) . " ==\n" . '{{' . $license . '}}' . "\n";
1409                         } else {
1410                                 $pageText = $comment;
1411                         }
1412                 }
1413                 return $pageText;
1414         }
1415 }