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