includes/specials/SpecialUpload.php

   1 <?php
   2 /**
   3  * @file
   4  * @ingroup 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  * @ingroup SpecialPage
  20  */
  21 class UploadForm {
  22         const SUCCESS = 0;
  23         const BEFORE_PROCESSING = 1;
  24         const LARGE_FILE_SERVER = 2;
  25         const EMPTY_FILE = 3;
  26         const MIN_LENGTH_PARTNAME = 4;
  27         const ILLEGAL_FILENAME = 5;
  28         const PROTECTED_PAGE = 6;
  29         const OVERWRITE_EXISTING_FILE = 7;
  30         const FILETYPE_MISSING = 8;
  31         const FILETYPE_BADTYPE = 9;
  32         const VERIFICATION_ERROR = 10;
  33         const UPLOAD_VERIFICATION_ERROR = 11;
  34         const UPLOAD_WARNING = 12;
  35         const INTERNAL_ERROR = 13;
  36
  37         /**#@+
  38          * @access private
  39          */
  40         var $mComment, $mLicense, $mIgnoreWarning, $mCurlError;
  41         var $mDestName, $mTempPath, $mFileSize, $mFileProps;
  42         var $mCopyrightStatus, $mCopyrightSource, $mReUpload, $mAction, $mUploadClicked;
  43         var $mSrcName, $mSessionKey, $mStashed, $mDesiredDestName, $mRemoveTempFile, $mSourceType;
  44         var $mDestWarningAck, $mCurlDestHandle;
  45         var $mLocalFile;
  46
  47         # Placeholders for text injection by hooks (must be HTML)
  48         # extensions should take care to _append_ to the present value
  49         var $uploadFormTextTop;
  50         var $uploadFormTextAfterSummary;
  51
  52         const SESSION_VERSION = 1;
  53         /**#@-*/
  54
  55         /**
  56          * Constructor : initialise object
  57          * Get data POSTed through the form and assign them to the object
  58          * @param $request Data posted.
  59          */
  60         function UploadForm( &$request ) {
  61                 global $wgAllowCopyUploads;
  62                 $this->mDesiredDestName   = $request->getText( 'wpDestFile' );
  63                 $this->mIgnoreWarning     = $request->getCheck( 'wpIgnoreWarning' );
  64                 $this->mComment           = $request->getText( 'wpUploadDescription' );
  65                 $this->mReUpload          = $request->getCheck( 'wpReUpload' );
  66
  67                 if( !$request->wasPosted() ) {
  68                         # GET requests just give the main form; no data except destination
  69                         # filename and description
  70                         return;
  71                 }
  72
  73                 # Placeholders for text injection by hooks (empty per default)
  74                 $this->uploadFormTextTop = "";
  75                 $this->uploadFormTextAfterSummary = "";
  76
  77                 $this->mReUpload          = $request->getCheck( 'wpReUpload' );
  78                 $this->mUploadClicked     = $request->getCheck( 'wpUpload' );
  79
  80                 $this->mLicense           = $request->getText( 'wpLicense' );
  81                 $this->mCopyrightStatus   = $request->getText( 'wpUploadCopyStatus' );
  82                 $this->mCopyrightSource   = $request->getText( 'wpUploadSource' );
  83                 $this->mWatchthis         = $request->getBool( 'wpWatchthis' );
  84                 $this->mSourceType        = $request->getText( 'wpSourceType' );
  85                 $this->mDestWarningAck    = $request->getText( 'wpDestFileWarningAck' );
  86
  87                 $this->mAction            = $request->getVal( 'action' );
  88
  89                 $this->mSessionKey        = $request->getInt( 'wpSessionKey' );
  90                 if( !empty( $this->mSessionKey ) &&
  91                         isset( $_SESSION['wsUploadData'][$this->mSessionKey]['version'] ) &&
  92                         $_SESSION['wsUploadData'][$this->mSessionKey]['version'] == self::SESSION_VERSION ) {
  93                         /**
  94                          * Confirming a temporarily stashed upload.
  95                          * We don't want path names to be forged, so we keep
  96                          * them in the session on the server and just give
  97                          * an opaque key to the user agent.
  98                          */
  99                         $data = $_SESSION['wsUploadData'][$this->mSessionKey];
 100                         $this->mTempPath         = $data['mTempPath'];
 101                         $this->mFileSize         = $data['mFileSize'];
 102                         $this->mSrcName          = $data['mSrcName'];
 103                         $this->mFileProps        = $data['mFileProps'];
 104                         $this->mCurlError        = 0/*UPLOAD_ERR_OK*/;
 105                         $this->mStashed          = true;
 106                         $this->mRemoveTempFile   = false;
 107                 } else {
 108                         /**
 109                          *Check for a newly uploaded file.
 110                          */
 111                         if( $wgAllowCopyUploads && $this->mSourceType == 'web' ) {
 112                                 $this->initializeFromUrl( $request );
 113                         } else {
 114                                 $this->initializeFromUpload( $request );
 115                         }
 116                 }
 117         }
 118
 119         /**
 120          * Initialize the uploaded file from PHP data
 121          * @access private
 122          */
 123         function initializeFromUpload( $request ) {
 124                 $this->mTempPath       = $request->getFileTempName( 'wpUploadFile' );
 125                 $this->mFileSize       = $request->getFileSize( 'wpUploadFile' );
 126                 $this->mSrcName        = $request->getFileName( 'wpUploadFile' );
 127                 $this->mCurlError      = $request->getUploadError( 'wpUploadFile' );
 128                 $this->mSessionKey     = false;
 129                 $this->mStashed        = false;
 130                 $this->mRemoveTempFile = false; // PHP will handle this
 131         }
 132
 133         /**
 134          * Copy a web file to a temporary file
 135          * @access private
 136          */
 137         function initializeFromUrl( $request ) {
 138                 global $wgTmpDirectory;
 139                 $url = $request->getText( 'wpUploadFileURL' );
 140                 $local_file = tempnam( $wgTmpDirectory, 'WEBUPLOAD' );
 141
 142                 $this->mTempPath       = $local_file;
 143                 $this->mFileSize       = 0; # Will be set by curlCopy
 144                 $this->mCurlError      = $this->curlCopy( $url, $local_file );
 145                 $pathParts             = explode( '/', $url );
 146                 $this->mSrcName        = array_pop( $pathParts );
 147                 $this->mSessionKey     = false;
 148                 $this->mStashed        = false;
 149
 150                 // PHP won't auto-cleanup the file
 151                 $this->mRemoveTempFile = file_exists( $local_file );
 152         }
 153
 154         /**
 155          * Safe copy from URL
 156          * Returns true if there was an error, false otherwise
 157          */
 158         private function curlCopy( $url, $dest ) {
 159                 global $wgUser, $wgOut;
 160
 161                 if( !$wgUser->isAllowed( 'upload_by_url' ) ) {
 162                         $wgOut->permissionRequired( 'upload_by_url' );
 163                         return true;
 164                 }
 165
 166                 # Maybe remove some pasting blanks :-)
 167                 $url =  trim( $url );
 168                 if( stripos($url, 'http://') !== 0 && stripos($url, 'ftp://') !== 0 ) {
 169                         # Only HTTP or FTP URLs
 170                         $wgOut->showErrorPage( 'upload-proto-error', 'upload-proto-error-text' );
 171                         return true;
 172                 }
 173
 174                 # Open temporary file
 175                 $this->mCurlDestHandle = @fopen( $this->mTempPath, "wb" );
 176                 if( $this->mCurlDestHandle === false ) {
 177                         # Could not open temporary file to write in
 178                         $wgOut->showErrorPage( 'upload-file-error', 'upload-file-error-text');
 179                         return true;
 180                 }
 181
 182                 $ch = curl_init();
 183                 curl_setopt( $ch, CURLOPT_HTTP_VERSION, 1.0); # Probably not needed, but apparently can work around some bug
 184                 curl_setopt( $ch, CURLOPT_TIMEOUT, 10); # 10 seconds timeout
 185                 curl_setopt( $ch, CURLOPT_LOW_SPEED_LIMIT, 512); # 0.5KB per second minimum transfer speed
 186                 curl_setopt( $ch, CURLOPT_URL, $url);
 187                 curl_setopt( $ch, CURLOPT_WRITEFUNCTION, array( $this, 'uploadCurlCallback' ) );
 188                 curl_exec( $ch );
 189                 $error = curl_errno( $ch ) ? true : false;
 190                 $errornum =  curl_errno( $ch );
 191                 // if ( $error ) print curl_error ( $ch ) ; # Debugging output
 192                 curl_close( $ch );
 193
 194                 fclose( $this->mCurlDestHandle );
 195                 unset( $this->mCurlDestHandle );
 196                 if( $error ) {
 197                         unlink( $dest );
 198                         if( wfEmptyMsg( "upload-curl-error$errornum", wfMsg("upload-curl-error$errornum") ) )
 199                                 $wgOut->showErrorPage( 'upload-misc-error', 'upload-misc-error-text' );
 200                         else
 201                                 $wgOut->showErrorPage( "upload-curl-error$errornum", "upload-curl-error$errornum-text" );
 202                 }
 203
 204                 return $error;
 205         }
 206
 207         /**
 208          * Callback function for CURL-based web transfer
 209          * Write data to file unless we've passed the length limit;
 210          * if so, abort immediately.
 211          * @access private
 212          */
 213         function uploadCurlCallback( $ch, $data ) {
 214                 global $wgMaxUploadSize;
 215                 $length = strlen( $data );
 216                 $this->mFileSize += $length;
 217                 if( $this->mFileSize > $wgMaxUploadSize ) {
 218                         return 0;
 219                 }
 220                 fwrite( $this->mCurlDestHandle, $data );
 221                 return $length;
 222         }
 223
 224         /**
 225          * Start doing stuff
 226          * @access public
 227          */
 228         function execute() {
 229                 global $wgUser, $wgOut;
 230                 global $wgEnableUploads;
 231
 232                 # Check php's file_uploads setting
 233                 if( !wfIniGetBool( 'file_uploads' ) ) {
 234                         $wgOut->showErrorPage( 'uploaddisabled', 'php-uploaddisabledtext', array( $this->mDesiredDestName ) );
 235                         return;
 236                 }
 237
 238                 # Check uploading enabled
 239                 if( !$wgEnableUploads ) {
 240                         $wgOut->showErrorPage( 'uploaddisabled', 'uploaddisabledtext', array( $this->mDesiredDestName ) );
 241                         return;
 242                 }
 243
 244                 # Check permissions
 245                 if( !$wgUser->isAllowed( 'upload' ) ) {
 246                         if( !$wgUser->isLoggedIn() ) {
 247                                 $wgOut->showErrorPage( 'uploadnologin', 'uploadnologintext' );
 248                         } else {
 249                                 $wgOut->permissionRequired( 'upload' );
 250                         }
 251                         return;
 252                 }
 253
 254                 # Check blocks
 255                 if( $wgUser->isBlocked() ) {
 256                         $wgOut->blockedPage();
 257                         return;
 258                 }
 259
 260                 if( wfReadOnly() ) {
 261                         $wgOut->readOnlyPage();
 262                         return;
 263                 }
 264
 265                 if( $this->mReUpload ) {
 266                         if( !$this->unsaveUploadedFile() ) {
 267                                 return;
 268                         }
 269                         # Because it is probably checked and shouldn't be
 270                         $this->mIgnoreWarning = false;
 271
 272                         $this->mainUploadForm();
 273                 } else if( 'submit' == $this->mAction || $this->mUploadClicked ) {
 274                         $this->processUpload();
 275                 } else {
 276                         $this->mainUploadForm();
 277                 }
 278
 279                 $this->cleanupTempFile();
 280         }
 281
 282         /**
 283          * Do the upload
 284          * Checks are made in SpecialUpload::execute()
 285          *
 286          * @access private
 287          */
 288         function processUpload(){
 289                 global $wgUser, $wgOut, $wgFileExtensions, $wgLang;
 290                 $details = null;
 291                 $value = null;
 292                 $value = $this->internalProcessUpload( $details );
 293
 294                 switch($value) {
 295                         case self::SUCCESS:
 296                                 $wgOut->redirect( $this->mLocalFile->getTitle()->getFullURL() );
 297                                 break;
 298
 299                         case self::BEFORE_PROCESSING:
 300                                 break;
 301
 302                         case self::LARGE_FILE_SERVER:
 303                                 $this->mainUploadForm( wfMsgHtml( 'largefileserver' ) );
 304                                 break;
 305
 306                         case self::EMPTY_FILE:
 307                                 $this->mainUploadForm( wfMsgHtml( 'emptyfile' ) );
 308                                 break;
 309
 310                         case self::MIN_LENGTH_PARTNAME:
 311                                 $this->mainUploadForm( wfMsgHtml( 'minlength1' ) );
 312                                 break;
 313
 314                         case self::ILLEGAL_FILENAME:
 315                                 $filtered = $details['filtered'];
 316                                 $this->uploadError( wfMsgWikiHtml( 'illegalfilename', htmlspecialchars( $filtered ) ) );
 317                                 break;
 318
 319                         case self::PROTECTED_PAGE:
 320                                 $wgOut->showPermissionsErrorPage( $details['permissionserrors'] );
 321                                 break;
 322
 323                         case self::OVERWRITE_EXISTING_FILE:
 324                                 $errorText = $details['overwrite'];
 325                                 $this->uploadError( $wgOut->parse( $errorText ) );
 326                                 break;
 327
 328                         case self::FILETYPE_MISSING:
 329                                 $this->uploadError( wfMsgExt( 'filetype-missing', array ( 'parseinline' ) ) );
 330                                 break;
 331
 332                         case self::FILETYPE_BADTYPE:
 333                                 $finalExt = $details['finalExt'];
 334                                 $this->uploadError(
 335                                         wfMsgExt( 'filetype-banned-type',
 336                                                 array( 'parseinline' ),
 337                                                 htmlspecialchars( $finalExt ),
 338                                                 $wgLang->commaList( $wgFileExtensions ),
 339                                                 $wgLang->formatNum( count($wgFileExtensions) )
 340                                         )
 341                                 );
 342                                 break;
 343
 344                         case self::VERIFICATION_ERROR:
 345                                 $veri = $details['veri'];
 346                                 $this->uploadError( $veri->toString() );
 347                                 break;
 348
 349                         case self::UPLOAD_VERIFICATION_ERROR:
 350                                 $error = $details['error'];
 351                                 $this->uploadError( $error );
 352                                 break;
 353
 354                         case self::UPLOAD_WARNING:
 355                                 $warning = $details['warning'];
 356                                 $this->uploadWarning( $warning );
 357                                 break;
 358
 359                         case self::INTERNAL_ERROR:
 360                                 $internal = $details['internal'];
 361                                 $this->showError( $internal );
 362                                 break;
 363
 364                         default:
 365                                 throw new MWException( __METHOD__ . ": Unknown value `{$value}`" );
 366                 }
 367         }
 368
 369         /**
 370          * Really do the upload
 371          * Checks are made in SpecialUpload::execute()
 372          *
 373          * @param array $resultDetails contains result-specific dict of additional values
 374          *
 375          * @access private
 376          */
 377         function internalProcessUpload( &$resultDetails ) {
 378                 global $wgUser;
 379
 380                 if( !wfRunHooks( 'UploadForm:BeforeProcessing', array( &$this ) ) )
 381                 {
 382                         wfDebug( "Hook 'UploadForm:BeforeProcessing' broke processing the file.\n" );
 383                         return self::BEFORE_PROCESSING;
 384                 }
 385
 386                 /**
 387                  * If there was no filename or a zero size given, give up quick.
 388                  */
 389                 if( trim( $this->mSrcName ) == '' || empty( $this->mFileSize ) ) {
 390                         return self::EMPTY_FILE;
 391                 }
 392
 393                 /* Check for curl error */
 394                 if( $this->mCurlError ) {
 395                         return self::BEFORE_PROCESSING;
 396                 }
 397
 398                 /**
 399                  * Chop off any directories in the given filename. Then
 400                  * filter out illegal characters, and try to make a legible name
 401                  * out of it. We'll strip some silently that Title would die on.
 402                  */
 403                 if( $this->mDesiredDestName ) {
 404                         $basename = $this->mDesiredDestName;
 405                 } else {
 406                         $basename = $this->mSrcName;
 407                 }
 408                 $filtered = wfStripIllegalFilenameChars( $basename );
 409
 410                 /* Normalize to title form before we do any further processing */
 411                 $nt = Title::makeTitleSafe( NS_FILE, $filtered );
 412                 if( is_null( $nt ) ) {
 413                         $resultDetails = array( 'filtered' => $filtered );
 414                         return self::ILLEGAL_FILENAME;
 415                 }
 416                 $filtered = $nt->getDBkey();
 417
 418                 /**
 419                  * We'll want to blacklist against *any* 'extension', and use
 420                  * only the final one for the whitelist.
 421                  */
 422                 list( $partname, $ext ) = $this->splitExtensions( $filtered );
 423
 424                 if( count( $ext ) ) {
 425                         $finalExt = $ext[count( $ext ) - 1];
 426                 } else {
 427                         $finalExt = '';
 428                 }
 429
 430                 # If there was more than one "extension", reassemble the base
 431                 # filename to prevent bogus complaints about length
 432                 if( count( $ext ) > 1 ) {
 433                         for( $i = 0; $i < count( $ext ) - 1; $i++ )
 434                                 $partname .= '.' . $ext[$i];
 435                 }
 436
 437                 if( strlen( $partname ) < 1 ) {
 438                         return self::MIN_LENGTH_PARTNAME;
 439                 }
 440
 441                 $this->mLocalFile = wfLocalFile( $nt );
 442                 $this->mDestName = $this->mLocalFile->getName();
 443
 444                 /**
 445                  * If the image is protected, non-sysop users won't be able
 446                  * to modify it by uploading a new revision.
 447                  */
 448                 $permErrors = $nt->getUserPermissionsErrors( 'edit', $wgUser );
 449                 $permErrorsUpload = $nt->getUserPermissionsErrors( 'upload', $wgUser );
 450                 $permErrorsCreate = ( $nt->exists() ? array() : $nt->getUserPermissionsErrors( 'create', $wgUser ) );
 451
 452                 if( $permErrors || $permErrorsUpload || $permErrorsCreate ) {
 453                         // merge all the problems into one list, avoiding duplicates
 454                         $permErrors = array_merge( $permErrors, wfArrayDiff2( $permErrorsUpload, $permErrors ) );
 455                         $permErrors = array_merge( $permErrors, wfArrayDiff2( $permErrorsCreate, $permErrors ) );
 456                         $resultDetails = array( 'permissionserrors' => $permErrors );
 457                         return self::PROTECTED_PAGE;
 458                 }
 459
 460                 /**
 461                  * In some cases we may forbid overwriting of existing files.
 462                  */
 463                 $overwrite = $this->checkOverwrite( $this->mDestName );
 464                 if( $overwrite !== true ) {
 465                         $resultDetails = array( 'overwrite' => $overwrite );
 466                         return self::OVERWRITE_EXISTING_FILE;
 467                 }
 468
 469                 /* Don't allow users to override the blacklist (check file extension) */
 470                 global $wgCheckFileExtensions, $wgStrictFileExtensions;
 471                 global $wgFileExtensions, $wgFileBlacklist;
 472                 if ($finalExt == '') {
 473                         return self::FILETYPE_MISSING;
 474                 } elseif ( $this->checkFileExtensionList( $ext, $wgFileBlacklist ) ||
 475                                 ($wgCheckFileExtensions && $wgStrictFileExtensions &&
 476                                         !$this->checkFileExtension( $finalExt, $wgFileExtensions ) ) ) {
 477                         $resultDetails = array( 'finalExt' => $finalExt );
 478                         return self::FILETYPE_BADTYPE;
 479                 }
 480
 481                 /**
 482                  * Look at the contents of the file; if we can recognize the
 483                  * type but it's corrupt or data of the wrong type, we should
 484                  * probably not accept it.
 485                  */
 486                 if( !$this->mStashed ) {
 487                         $this->mFileProps = File::getPropsFromPath( $this->mTempPath, $finalExt );
 488                         $this->checkMacBinary();
 489                         $veri = $this->verify( $this->mTempPath, $finalExt );
 490
 491                         if( $veri !== true ) { //it's a wiki error...
 492                                 $resultDetails = array( 'veri' => $veri );
 493                                 return self::VERIFICATION_ERROR;
 494                         }
 495
 496                         /**
 497                          * Provide an opportunity for extensions to add further checks
 498                          */
 499                         $error = '';
 500                         if( !wfRunHooks( 'UploadVerification',
 501                                         array( $this->mDestName, $this->mTempPath, &$error ) ) ) {
 502                                 $resultDetails = array( 'error' => $error );
 503                                 return self::UPLOAD_VERIFICATION_ERROR;
 504                         }
 505                 }
 506
 507
 508                 /**
 509                  * Check for non-fatal conditions
 510                  */
 511                 if ( ! $this->mIgnoreWarning ) {
 512                         $warning = '';
 513
 514                         $comparableName = str_replace( ' ', '_', $basename );
 515                         global $wgCapitalLinks, $wgContLang;
 516                         if ( $wgCapitalLinks ) {
 517                                 $comparableName = $wgContLang->ucfirst( $comparableName );
 518                         }
 519
 520                         if( $comparableName !== $filtered ) {
 521                                 $warning .=  '<li>'.wfMsgHtml( 'badfilename', htmlspecialchars( $this->mDestName ) ).'</li>';
 522                         }
 523
 524                         global $wgCheckFileExtensions;
 525                         if ( $wgCheckFileExtensions ) {
 526                                 if ( !$this->checkFileExtension( $finalExt, $wgFileExtensions ) ) {
 527                                         global $wgLang;
 528                                         $warning .= '<li>' .
 529                                         wfMsgExt( 'filetype-unwanted-type',
 530                                                 array( 'parseinline' ),
 531                                                 htmlspecialchars( $finalExt ),
 532                                                 $wgLang->commaList( $wgFileExtensions ),
 533                                                 $wgLang->formatNum( count($wgFileExtensions) )
 534                                         ) . '</li>';
 535                                 }
 536                         }
 537
 538                         global $wgUploadSizeWarning;
 539                         if ( $wgUploadSizeWarning && ( $this->mFileSize > $wgUploadSizeWarning ) ) {
 540                                 $skin = $wgUser->getSkin();
 541                                 $wsize = $skin->formatSize( $wgUploadSizeWarning );
 542                                 $asize = $skin->formatSize( $this->mFileSize );
 543                                 $warning .= '<li>' . wfMsgHtml( 'large-file', $wsize, $asize ) . '</li>';
 544                         }
 545                         if ( $this->mFileSize == 0 ) {
 546                                 $warning .= '<li>'.wfMsgHtml( 'emptyfile' ).'</li>';
 547                         }
 548
 549                         if ( !$this->mDestWarningAck ) {
 550                                 $warning .= self::getExistsWarning( $this->mLocalFile );
 551                         }
 552
 553                         $warning .= $this->getDupeWarning( $this->mTempPath, $finalExt, $nt );
 554
 555                         if( $warning != '' ) {
 556                                 /**
 557                                  * Stash the file in a temporary location; the user can choose
 558                                  * to let it through and we'll complete the upload then.
 559                                  */
 560                                 $resultDetails = array( 'warning' => $warning );
 561                                 return self::UPLOAD_WARNING;
 562                         }
 563                 }
 564
 565                 /**
 566                  * Try actually saving the thing...
 567                  * It will show an error form on failure.
 568                  */
 569                 if( !$this->mReUpload ) {
 570                         $pageText = self::getInitialPageText( $this->mComment, $this->mLicense,
 571                                 $this->mCopyrightStatus, $this->mCopyrightSource );
 572                 }
 573
 574                 $status = $this->mLocalFile->upload( $this->mTempPath, $this->mComment, $pageText,
 575                         File::DELETE_SOURCE, $this->mFileProps );
 576                 if ( !$status->isGood() ) {
 577                         $resultDetails = array( 'internal' => $status->getWikiText() );
 578                         return self::INTERNAL_ERROR;
 579                 } else {
 580                         if ( $this->mWatchthis ) {
 581                                 global $wgUser;
 582                                 $wgUser->addWatch( $this->mLocalFile->getTitle() );
 583                         }
 584                         // Success, redirect to description page
 585                         $img = null; // @todo: added to avoid passing a ref to null - should this be defined somewhere?
 586                         wfRunHooks( 'UploadComplete', array( &$this ) );
 587                         return self::SUCCESS;
 588                 }
 589         }
 590
 591         /**
 592          * Do existence checks on a file and produce a warning
 593          * This check is static and can be done pre-upload via AJAX
 594          * Returns an HTML fragment consisting of one or more LI elements if there is a warning
 595          * Returns an empty string if there is no warning
 596          */
 597         static function getExistsWarning( $file ) {
 598                 global $wgUser, $wgContLang;
 599                 // Check for uppercase extension. We allow these filenames but check if an image
 600                 // with lowercase extension exists already
 601                 $warning = '';
 602                 $align = $wgContLang->isRtl() ? 'left' : 'right';
 603
 604                 if( strpos( $file->getName(), '.' ) == false ) {
 605                         $partname = $file->getName();
 606                         $rawExtension = '';
 607                 } else {
 608                         $n = strrpos( $file->getName(), '.' );
 609                         $rawExtension = substr( $file->getName(), $n + 1 );
 610                         $partname = substr( $file->getName(), 0, $n );
 611                 }
 612
 613                 $sk = $wgUser->getSkin();
 614
 615                 if ( $rawExtension != $file->getExtension() ) {
 616                         // We're not using the normalized form of the extension.
 617                         // Normal form is lowercase, using most common of alternate
 618                         // extensions (eg 'jpg' rather than 'JPEG').
 619                         //
 620                         // Check for another file using the normalized form...
 621                         $nt_lc = Title::makeTitle( NS_FILE, $partname . '.' . $file->getExtension() );
 622                         $file_lc = wfLocalFile( $nt_lc );
 623                 } else {
 624                         $file_lc = false;
 625                 }
 626
 627                 if( $file->exists() ) {
 628                         $dlink = $sk->makeKnownLinkObj( $file->getTitle() );
 629                         if ( $file->allowInlineDisplay() ) {
 630                                 $dlink2 = $sk->makeImageLinkObj( $file->getTitle(), wfMsgExt( 'fileexists-thumb', 'parseinline' ),
 631                                         $file->getName(), $align, array(), false, true );
 632                         } elseif ( !$file->allowInlineDisplay() && $file->isSafeFile() ) {
 633                                 $icon = $file->iconThumb();
 634                                 $dlink2 = '<div style="float:' . $align . '" id="mw-media-icon">' .
 635                                         $icon->toHtml( array( 'desc-link' => true ) ) . '<br />' . $dlink . '</div>';
 636                         } else {
 637                                 $dlink2 = '';
 638                         }
 639
 640                         $warning .= '<li>' . wfMsgExt( 'fileexists', array('parseinline','replaceafter'), $dlink ) . '</li>' . $dlink2;
 641
 642                 } elseif( $file->getTitle()->getArticleID() ) {
 643                         $lnk = $sk->makeKnownLinkObj( $file->getTitle(), '', 'redirect=no' );
 644                         $warning .= '<li>' . wfMsgExt( 'filepageexists', array( 'parseinline', 'replaceafter' ), $lnk ) . '</li>';
 645                 } elseif ( $file_lc && $file_lc->exists() ) {
 646                         # Check if image with lowercase extension exists.
 647                         # It's not forbidden but in 99% it makes no sense to upload the same filename with uppercase extension
 648                         $dlink = $sk->makeKnownLinkObj( $nt_lc );
 649                         if ( $file_lc->allowInlineDisplay() ) {
 650                                 $dlink2 = $sk->makeImageLinkObj( $nt_lc, wfMsgExt( 'fileexists-thumb', 'parseinline' ),
 651                                         $nt_lc->getText(), $align, array(), false, true );
 652                         } elseif ( !$file_lc->allowInlineDisplay() && $file_lc->isSafeFile() ) {
 653                                 $icon = $file_lc->iconThumb();
 654                                 $dlink2 = '<div style="float:' . $align . '" id="mw-media-icon">' .
 655                                         $icon->toHtml( array( 'desc-link' => true ) ) . '<br />' . $dlink . '</div>';
 656                         } else {
 657                                 $dlink2 = '';
 658                         }
 659
 660                         $warning .= '<li>' .
 661                                 wfMsgExt( 'fileexists-extension', 'parsemag',
 662                                         $file->getTitle()->getPrefixedText(), $dlink ) .
 663                                 '</li>' . $dlink2;
 664
 665                 } elseif ( ( substr( $partname , 3, 3 ) == 'px-' || substr( $partname , 2, 3 ) == 'px-' )
 666                         && ereg( "[0-9]{2}" , substr( $partname , 0, 2) ) )
 667                 {
 668                         # Check for filenames like 50px- or 180px-, these are mostly thumbnails
 669                         $nt_thb = Title::newFromText( substr( $partname , strpos( $partname , '-' ) +1 ) . '.' . $rawExtension );
 670                         $file_thb = wfLocalFile( $nt_thb );
 671                         if ($file_thb->exists() ) {
 672                                 # Check if an image without leading '180px-' (or similiar) exists
 673                                 $dlink = $sk->makeKnownLinkObj( $nt_thb);
 674                                 if ( $file_thb->allowInlineDisplay() ) {
 675                                         $dlink2 = $sk->makeImageLinkObj( $nt_thb,
 676                                                 wfMsgExt( 'fileexists-thumb', 'parseinline' ),
 677                                                 $nt_thb->getText(), $align, array(), false, true );
 678                                 } elseif ( !$file_thb->allowInlineDisplay() && $file_thb->isSafeFile() ) {
 679                                         $icon = $file_thb->iconThumb();
 680                                         $dlink2 = '<div style="float:' . $align . '" id="mw-media-icon">' .
 681                                                 $icon->toHtml( array( 'desc-link' => true ) ) . '<br />' .
 682                                                 $dlink . '</div>';
 683                                 } else {
 684                                         $dlink2 = '';
 685                                 }
 686
 687                                 $warning .= '<li>' . wfMsgExt( 'fileexists-thumbnail-yes', 'parsemag', $dlink ) .
 688                                         '</li>' . $dlink2;
 689                         } else {
 690                                 # Image w/o '180px-' does not exists, but we do not like these filenames
 691                                 $warning .= '<li>' . wfMsgExt( 'file-thumbnail-no', 'parseinline' ,
 692                                         substr( $partname , 0, strpos( $partname , '-' ) +1 ) ) . '</li>';
 693                         }
 694                 }
 695
 696                 $filenamePrefixBlacklist = self::getFilenamePrefixBlacklist();
 697                 # Do the match
 698                 foreach( $filenamePrefixBlacklist as $prefix ) {
 699                         if ( substr( $partname, 0, strlen( $prefix ) ) == $prefix ) {
 700                                 $warning .= '<li>' . wfMsgExt( 'filename-bad-prefix', 'parseinline', $prefix ) . '</li>';
 701                                 break;
 702                         }
 703                 }
 704
 705                 if ( $file->wasDeleted() && !$file->exists() ) {
 706                         # If the file existed before and was deleted, warn the user of this
 707                         # Don't bother doing so if the file exists now, however
 708                         $ltitle = SpecialPage::getTitleFor( 'Log' );
 709                         $llink = $sk->makeKnownLinkObj( $ltitle, wfMsgHtml( 'deletionlog' ),
 710                                 'type=delete&page=' . $file->getTitle()->getPrefixedUrl() );
 711                         $warning .= '<li>' . wfMsgWikiHtml( 'filewasdeleted', $llink ) . '</li>';
 712                 }
 713                 return $warning;
 714         }
 715
 716         /**
 717          * Get a list of warnings
 718          *
 719          * @param string local filename, e.g. 'file exists', 'non-descriptive filename'
 720          * @return array list of warning messages
 721          */
 722         static function ajaxGetExistsWarning( $filename ) {
 723                 $file = wfFindFile( $filename );
 724                 if( !$file ) {
 725                         // Force local file so we have an object to do further checks against
 726                         // if there isn't an exact match...
 727                         $file = wfLocalFile( $filename );
 728                 }
 729                 $s = '&nbsp;';
 730                 if ( $file ) {
 731                         $warning = self::getExistsWarning( $file );
 732                         if ( $warning !== '' ) {
 733                                 $s = "<ul>$warning</ul>";
 734                         }
 735                 }
 736                 return $s;
 737         }
 738
 739         /**
 740          * Render a preview of a given license for the AJAX preview on upload
 741          *
 742          * @param string $license
 743          * @return string
 744          */
 745         public static function ajaxGetLicensePreview( $license ) {
 746                 global $wgParser, $wgUser;
 747                 $text = '{{' . $license . '}}';
 748                 $title = Title::makeTitle( NS_FILE, 'Sample.jpg' );
 749                 $options = ParserOptions::newFromUser( $wgUser );
 750
 751                 // Expand subst: first, then live templates...
 752                 $text = $wgParser->preSaveTransform( $text, $title, $wgUser, $options );
 753                 $output = $wgParser->parse( $text, $title, $options );
 754
 755                 return $output->getText();
 756         }
 757
 758         /**
 759          * Check for duplicate files and throw up a warning before the upload
 760          * completes.
 761          */
 762         function getDupeWarning( $tempfile, $extension, $destinationTitle ) {
 763                 $hash = File::sha1Base36( $tempfile );
 764                 $dupes = RepoGroup::singleton()->findBySha1( $hash );
 765                 $archivedImage = new ArchivedFile( null, 0, $hash.".$extension" );
 766                 if( $dupes ) {
 767                         global $wgOut;
 768                         $msg = "<gallery>";
 769                         foreach( $dupes as $file ) {
 770                                 $title = $file->getTitle();
 771                                 # Don't throw the warning when the titles are the same, it's a reupload
 772                                 # and highly redundant.
 773                                 if ( !$title->equals( $destinationTitle ) || !$this->mReUpload ) {
 774                                         $msg .= $title->getPrefixedText() .
 775                                                 "|" . $title->getText() . "\n";
 776                                 }
 777                         }
 778                         $msg .= "</gallery>";
 779                         return "<li>" .
 780                                 wfMsgExt( "file-exists-duplicate", array( "parse" ), count( $dupes ) ) .
 781                                 $wgOut->parse( $msg ) .
 782                                 "</li>\n";
 783                 } elseif ( $archivedImage->getID() > 0 ) {
 784                         global $wgOut;
 785                         $name = Title::makeTitle( NS_FILE, $archivedImage->getName() )->getPrefixedText();
 786                         return Xml::tags( 'li', null, wfMsgExt( 'file-deleted-duplicate', array( 'parseinline' ), array( $name ) ) );
 787                 } else {
 788                         return '';
 789                 }
 790         }
 791
 792         /**
 793          * Get a list of blacklisted filename prefixes from [[MediaWiki:filename-prefix-blacklist]]
 794          *
 795          * @return array list of prefixes
 796          */
 797         public static function getFilenamePrefixBlacklist() {
 798                 $blacklist = array();
 799                 $message = wfMsgForContent( 'filename-prefix-blacklist' );
 800                 if( $message && !( wfEmptyMsg( 'filename-prefix-blacklist', $message ) || $message == '-' ) ) {
 801                         $lines = explode( "\n", $message );
 802                         foreach( $lines as $line ) {
 803                                 // Remove comment lines
 804                                 $comment = substr( trim( $line ), 0, 1 );
 805                                 if ( $comment == '#' || $comment == '' ) {
 806                                         continue;
 807                                 }
 808                                 // Remove additional comments after a prefix
 809                                 $comment = strpos( $line, '#' );
 810                                 if ( $comment > 0 ) {
 811                                         $line = substr( $line, 0, $comment-1 );
 812                                 }
 813                                 $blacklist[] = trim( $line );
 814                         }
 815                 }
 816                 return $blacklist;
 817         }
 818
 819         /**
 820          * Stash a file in a temporary directory for later processing
 821          * after the user has confirmed it.
 822          *
 823          * If the user doesn't explicitly cancel or accept, these files
 824          * can accumulate in the temp directory.
 825          *
 826          * @param string $saveName - the destination filename
 827          * @param string $tempName - the source temporary file to save
 828          * @return string - full path the stashed file, or false on failure
 829          * @access private
 830          */
 831         function saveTempUploadedFile( $saveName, $tempName ) {
 832                 global $wgOut;
 833                 $repo = RepoGroup::singleton()->getLocalRepo();
 834                 $status = $repo->storeTemp( $saveName, $tempName );
 835                 if ( !$status->isGood() ) {
 836                         $this->showError( $status->getWikiText() );
 837                         return false;
 838                 } else {
 839                         return $status->value;
 840                 }
 841         }
 842
 843         /**
 844          * Stash a file in a temporary directory for later processing,
 845          * and save the necessary descriptive info into the session.
 846          * Returns a key value which will be passed through a form
 847          * to pick up the path info on a later invocation.
 848          *
 849          * @return int
 850          * @access private
 851          */
 852         function stashSession() {
 853                 $stash = $this->saveTempUploadedFile( $this->mDestName, $this->mTempPath );
 854
 855                 if( !$stash ) {
 856                         # Couldn't save the file.
 857                         return false;
 858                 }
 859
 860                 $key = mt_rand( 0, 0x7fffffff );
 861                 $_SESSION['wsUploadData'][$key] = array(
 862                         'mTempPath'       => $stash,
 863                         'mFileSize'       => $this->mFileSize,
 864                         'mSrcName'        => $this->mSrcName,
 865                         'mFileProps'      => $this->mFileProps,
 866                         'version'         => self::SESSION_VERSION,
 867                 );
 868                 return $key;
 869         }
 870
 871         /**
 872          * Remove a temporarily kept file stashed by saveTempUploadedFile().
 873          * @access private
 874          * @return success
 875          */
 876         function unsaveUploadedFile() {
 877                 global $wgOut;
 878                 if( !$this->mTempPath ) return true; // nothing to delete
 879                 $repo = RepoGroup::singleton()->getLocalRepo();
 880                 $success = $repo->freeTemp( $this->mTempPath );
 881                 if ( ! $success ) {
 882                         $wgOut->showFileDeleteError( $this->mTempPath );
 883                         return false;
 884                 } else {
 885                         return true;
 886                 }
 887         }
 888
 889         /* -------------------------------------------------------------- */
 890
 891         /**
 892          * @param string $error as HTML
 893          * @access private
 894          */
 895         function uploadError( $error ) {
 896                 global $wgOut;
 897                 $wgOut->addHTML( '<h2>' . wfMsgHtml( 'uploadwarning' ) . "</h2>\n" );
 898                 $wgOut->addHTML( '<span class="error">' . $error . '</span>' );
 899         }
 900
 901         /**
 902          * There's something wrong with this file, not enough to reject it
 903          * totally but we require manual intervention to save it for real.
 904          * Stash it away, then present a form asking to confirm or cancel.
 905          *
 906          * @param string $warning as HTML
 907          * @access private
 908          */
 909         function uploadWarning( $warning ) {
 910                 global $wgOut;
 911                 global $wgUseCopyrightUpload;
 912
 913                 $this->mSessionKey = $this->stashSession();
 914                 if( !$this->mSessionKey ) {
 915                         # Couldn't save file; an error has been displayed so let's go.
 916                         return;
 917                 }
 918
 919                 $wgOut->addHTML( '<h2>' . wfMsgHtml( 'uploadwarning' ) . "</h2>\n" );
 920                 $wgOut->addHTML( '<ul class="warning">' . $warning . "</ul>\n" );
 921
 922                 $titleObj = SpecialPage::getTitleFor( 'Upload' );
 923
 924                 if ( $wgUseCopyrightUpload ) {
 925                         $copyright = Xml::hidden( 'wpUploadCopyStatus', $this->mCopyrightStatus ) . "\n" .
 926                                         Xml::hidden( 'wpUploadSource', $this->mCopyrightSource ) . "\n";
 927                 } else {
 928                         $copyright = '';
 929                 }
 930
 931                 $wgOut->addHTML(
 932                         Xml::openElement( 'form', array( 'method' => 'post', 'action' => $titleObj->getLocalURL( 'action=submit' ),
 933                                  'enctype' => 'multipart/form-data', 'id' => 'uploadwarning' ) ) . "\n" .
 934                         Xml::hidden( 'wpIgnoreWarning', '1' ) . "\n" .
 935                         Xml::hidden( 'wpSessionKey', $this->mSessionKey ) . "\n" .
 936                         Xml::hidden( 'wpUploadDescription', $this->mComment ) . "\n" .
 937                         Xml::hidden( 'wpLicense', $this->mLicense ) . "\n" .
 938                         Xml::hidden( 'wpDestFile', $this->mDesiredDestName ) . "\n" .
 939                         Xml::hidden( 'wpWatchthis', $this->mWatchthis ) . "\n" .
 940                         "{$copyright}<br />" .
 941                         Xml::submitButton( wfMsg( 'ignorewarning' ), array ( 'name' => 'wpUpload', 'id' => 'wpUpload', 'checked' => 'checked' ) ) . ' ' .
 942                         Xml::submitButton( wfMsg( 'reuploaddesc' ), array ( 'name' => 'wpReUpload', 'id' => 'wpReUpload' ) ) .
 943                         Xml::closeElement( 'form' ) . "\n"
 944                 );
 945         }
 946
 947         /**
 948          * Displays the main upload form, optionally with a highlighted
 949          * error message up at the top.
 950          *
 951          * @param string $msg as HTML
 952          * @access private
 953          */
 954         function mainUploadForm( $msg='' ) {
 955                 global $wgOut, $wgUser, $wgLang, $wgMaxUploadSize;
 956                 global $wgUseCopyrightUpload, $wgUseAjax, $wgAjaxUploadDestCheck, $wgAjaxLicensePreview;
 957                 global $wgRequest, $wgAllowCopyUploads;
 958                 global $wgStylePath, $wgStyleVersion;
 959
 960                 $useAjaxDestCheck = $wgUseAjax && $wgAjaxUploadDestCheck;
 961                 $useAjaxLicensePreview = $wgUseAjax && $wgAjaxLicensePreview;
 962
 963                 $adc = wfBoolToStr( $useAjaxDestCheck );
 964                 $alp = wfBoolToStr( $useAjaxLicensePreview );
 965                 $autofill = wfBoolToStr( $this->mDesiredDestName == '' );
 966
 967                 $wgOut->addScript( "<script type=\"text/javascript\">
 968 wgAjaxUploadDestCheck = {$adc};
 969 wgAjaxLicensePreview = {$alp};
 970 wgUploadAutoFill = {$autofill};
 971 </script>" );
 972                 $wgOut->addScriptFile( 'upload.js' );
 973                 $wgOut->addScriptFile( 'edit.js' ); // For <charinsert> support
 974
 975                 if( !wfRunHooks( 'UploadForm:initial', array( &$this ) ) )
 976                 {
 977                         wfDebug( "Hook 'UploadForm:initial' broke output of the upload form\n" );
 978                         return false;
 979                 }
 980
 981                 if( $this->mDesiredDestName ) {
 982                         $title = Title::makeTitleSafe( NS_FILE, $this->mDesiredDestName );
 983                         // Show a subtitle link to deleted revisions (to sysops et al only)
 984                         if( $title instanceof Title && ( $count = $title->isDeleted() ) > 0 && $wgUser->isAllowed( 'deletedhistory' ) ) {
 985                                 $link = wfMsgExt(
 986                                         $wgUser->isAllowed( 'delete' ) ? 'thisisdeleted' : 'viewdeleted',
 987                                         array( 'parse', 'replaceafter' ),
 988                                         $wgUser->getSkin()->makeKnownLinkObj(
 989                                                 SpecialPage::getTitleFor( 'Undelete', $title->getPrefixedText() ),
 990                                                 wfMsgExt( 'restorelink', array( 'parsemag', 'escape' ), $count )
 991                                         )
 992                                 );
 993                                 $wgOut->addHTML( "<div id=\"contentSub2\">{$link}</div>" );
 994                         }
 995
 996                         // Show the relevant lines from deletion log (for still deleted files only)
 997                         if( $title instanceof Title && $title->isDeleted() > 0 && !$title->exists() ) {
 998                                 $this->showDeletionLog( $wgOut, $title->getPrefixedText() );
 999                         }
1000                 }
1001
1002                 $cols = intval($wgUser->getOption( 'cols' ));
1003
1004                 if( $wgUser->getOption( 'editwidth' ) ) {
1005                         $width = " style=\"width:100%\"";
1006                 } else {
1007                         $width = '';
1008                 }
1009
1010                 if ( '' != $msg ) {
1011                         $sub = wfMsgHtml( 'uploaderror' );
1012                         $wgOut->addHTML( "<h2>{$sub}</h2>\n" .
1013                           "<span class='error'>{$msg}</span>\n" );
1014                 }
1015                 $wgOut->addHTML( '<div id="uploadtext">' );
1016                 $wgOut->addWikiMsg( 'uploadtext', $this->mDesiredDestName );
1017                 $wgOut->addHTML( "</div>\n" );
1018
1019                 # Print a list of allowed file extensions, if so configured.  We ignore
1020                 # MIME type here, it's incomprehensible to most people and too long.
1021                 global $wgCheckFileExtensions, $wgStrictFileExtensions,
1022                 $wgFileExtensions, $wgFileBlacklist;
1023
1024                 $allowedExtensions = '';
1025                 if( $wgCheckFileExtensions ) {
1026                         if( $wgStrictFileExtensions ) {
1027                                 # Everything not permitted is banned
1028                                 $extensionsList =
1029                                         '<div id="mw-upload-permitted">' .
1030                                         wfMsgWikiHtml( 'upload-permitted', $wgLang->commaList( $wgFileExtensions ) ) .
1031                                         "</div>\n";
1032                         } else {
1033                                 # We have to list both preferred and prohibited
1034                                 $extensionsList =
1035                                         '<div id="mw-upload-preferred">' .
1036                                         wfMsgWikiHtml( 'upload-preferred', $wgLang->commaList( $wgFileExtensions ) ) .
1037                                         "</div>\n" .
1038                                         '<div id="mw-upload-prohibited">' .
1039                                         wfMsgWikiHtml( 'upload-prohibited', $wgLang->commaList( $wgFileBlacklist ) ) .
1040                                         "</div>\n";
1041                         }
1042                 } else {
1043                         # Everything is permitted.
1044                         $extensionsList = '';
1045                 }
1046
1047                 # Get the maximum file size from php.ini as $wgMaxUploadSize works for uploads from URL via CURL only
1048                 # See http://www.php.net/manual/en/ini.core.php#ini.upload-max-filesize for possible values of upload_max_filesize
1049                 $val = trim( ini_get( 'upload_max_filesize' ) );
1050                 $last = strtoupper( ( substr( $val, -1 ) ) );
1051                 switch( $last ) {
1052                         case 'G':
1053                                 $val2 = substr( $val, 0, -1 ) * 1024 * 1024 * 1024;
1054                                 break;
1055                         case 'M':
1056                                 $val2 = substr( $val, 0, -1 ) * 1024 * 1024;
1057                                 break;
1058                         case 'K':
1059                                 $val2 = substr( $val, 0, -1 ) * 1024;
1060                                 break;
1061                         default:
1062                                 $val2 = $val;
1063                 }
1064                 $val2 = $wgAllowCopyUploads ? min( $wgMaxUploadSize, $val2 ) : $val2;
1065                 $maxUploadSize = '<div id="mw-upload-maxfilesize">' .
1066                         wfMsgExt( 'upload-maxfilesize', array( 'parseinline', 'escapenoentities' ),
1067                                 $wgLang->formatSize( $val2 ) ) .
1068                                 "</div>\n";
1069
1070                 $sourcefilename = wfMsgExt( 'sourcefilename', array( 'parseinline', 'escapenoentities' ) );
1071         $destfilename = wfMsgExt( 'destfilename', array( 'parseinline', 'escapenoentities' ) );
1072
1073                 $msg = $this->mReUpload ? 'filereuploadsummary' : 'fileuploadsummary';
1074                 $summary = wfMsgExt( $msg, 'parseinline' );
1075
1076                 $licenses = new Licenses();
1077                 $license = wfMsgExt( 'license', array( 'parseinline' ) );
1078                 $nolicense = wfMsgHtml( 'nolicense' );
1079                 $licenseshtml = $licenses->getHtml();
1080
1081                 $ulb = wfMsgHtml( 'uploadbtn' );
1082
1083
1084                 $titleObj = SpecialPage::getTitleFor( 'Upload' );
1085
1086                 $encDestName = htmlspecialchars( $this->mDesiredDestName );
1087
1088                 $watchChecked = $this->watchCheck() ? 'checked="checked"' : '';
1089                 # Re-uploads should not need "file exist already" warnings
1090                 $warningChecked = ($this->mIgnoreWarning || $this->mReUpload) ? 'checked="checked"' : '';
1091
1092                 // Prepare form for upload or upload/copy
1093                 if( $wgAllowCopyUploads && $wgUser->isAllowed( 'upload_by_url' ) ) {
1094                         $filename_form =
1095                                 "<input type='radio' id='wpSourceTypeFile' name='wpSourceType' value='file' " .
1096                                    "onchange='toggle_element_activation(\"wpUploadFileURL\",\"wpUploadFile\")' checked='checked' />" .
1097                                  "<input tabindex='1' type='file' name='wpUploadFile' id='wpUploadFile' " .
1098                                    "onfocus='" .
1099                                      "toggle_element_activation(\"wpUploadFileURL\",\"wpUploadFile\");" .
1100                                      "toggle_element_check(\"wpSourceTypeFile\",\"wpSourceTypeURL\")' " .
1101                                      "onchange='fillDestFilename(\"wpUploadFile\")' size='60' />" .
1102                                 wfMsgHTML( 'upload_source_file' ) . "<br/>" .
1103                                 "<input type='radio' id='wpSourceTypeURL' name='wpSourceType' value='web' " .
1104                                   "onchange='toggle_element_activation(\"wpUploadFile\",\"wpUploadFileURL\")' />" .
1105                                 "<input tabindex='1' type='text' name='wpUploadFileURL' id='wpUploadFileURL' " .
1106                                   "onfocus='" .
1107                                     "toggle_element_activation(\"wpUploadFile\",\"wpUploadFileURL\");" .
1108                                     "toggle_element_check(\"wpSourceTypeURL\",\"wpSourceTypeFile\")' " .
1109                                     "onchange='fillDestFilename(\"wpUploadFileURL\")' size='60' disabled='disabled' />" .
1110                                 wfMsgHtml( 'upload_source_url' ) ;
1111                 } else {
1112                         $filename_form =
1113                                 "<input tabindex='1' type='file' name='wpUploadFile' id='wpUploadFile' " .
1114                                 ($this->mDesiredDestName?"":"onchange='fillDestFilename(\"wpUploadFile\")' ") .
1115                                 "size='60' />" .
1116                                 "<input type='hidden' name='wpSourceType' value='file' />" ;
1117                 }
1118                 if ( $useAjaxDestCheck ) {
1119                         $warningRow = "<tr><td colspan='2' id='wpDestFile-warning'>&nbsp;</td></tr>";
1120                         $destOnkeyup = 'onkeyup="wgUploadWarningObj.keypress();"';
1121                 } else {
1122                         $warningRow = '';
1123                         $destOnkeyup = '';
1124                 }
1125                 # Uploading a new version? If so, the name is fixed.
1126                 $on = $this->mReUpload ? "readonly='readonly'" : "";
1127
1128                 $encComment = htmlspecialchars( $this->mComment );
1129
1130                 $wgOut->addHTML(
1131                          Xml::openElement( 'form', array( 'method' => 'post', 'action' => $titleObj->getLocalURL(),
1132                                  'enctype' => 'multipart/form-data', 'id' => 'mw-upload-form' ) ) .
1133                          Xml::openElement( 'fieldset' ) .
1134                          Xml::element( 'legend', null, wfMsg( 'upload' ) ) .
1135                          Xml::openElement( 'table', array( 'border' => '0', 'id' => 'mw-upload-table' ) ) .
1136                          "<tr>
1137                                 {$this->uploadFormTextTop}
1138                                 <td class='mw-label'>
1139                                         <label for='wpUploadFile'>{$sourcefilename}</label>
1140                                 </td>
1141                                 <td class='mw-input'>
1142                                         {$filename_form}
1143                                 </td>
1144                         </tr>
1145                         <tr>
1146                                 <td></td>
1147                                 <td>
1148                                         {$maxUploadSize}
1149                                         {$extensionsList}
1150                                 </td>
1151                         </tr>
1152                         <tr>
1153                                 <td class='mw-label'>
1154                                         <label for='wpDestFile'>{$destfilename}</label>
1155                                 </td>
1156                                 <td class='mw-input'>
1157                                         <input tabindex='2' type='text' name='wpDestFile' id='wpDestFile' size='60'
1158                                                 value=\"{$encDestName}\" onchange='toggleFilenameFiller()' $on $destOnkeyup />
1159                                 </td>
1160                         </tr>
1161                         <tr>
1162                                 <td class='mw-label'>
1163                                         <label for='wpUploadDescription'>{$summary}</label>
1164                                 </td>
1165                                 <td class='mw-input'>
1166                                         <textarea tabindex='3' name='wpUploadDescription' id='wpUploadDescription' rows='6'
1167                                                 cols='{$cols}'{$width}>$encComment</textarea>
1168                                         {$this->uploadFormTextAfterSummary}
1169                                 </td>
1170                         </tr>
1171                         <tr>"
1172                 );
1173                 # Re-uploads should not need license info
1174                 if ( !$this->mReUpload && $licenseshtml != '' ) {
1175                         global $wgStylePath;
1176                         $wgOut->addHTML( "
1177                                         <td class='mw-label'>
1178                                                 <label for='wpLicense'>$license</label>
1179                                         </td>
1180                                         <td class='mw-input'>
1181                                                 <select name='wpLicense' id='wpLicense' tabindex='4'
1182                                                         onchange='licenseSelectorCheck()'>
1183                                                         <option value=''>$nolicense</option>
1184                                                         $licenseshtml
1185                                                 </select>
1186                                         </td>
1187                                 </tr>
1188                                 <tr>"
1189                         );
1190                         if( $useAjaxLicensePreview ) {
1191                                 $wgOut->addHTML( "
1192                                                 <td></td>
1193                                                 <td id=\"mw-license-preview\"></td>
1194                                         </tr>
1195                                         <tr>"
1196                                 );
1197                         }
1198                 }
1199
1200                 if ( !$this->mReUpload && $wgUseCopyrightUpload ) {
1201                         $filestatus = wfMsgExt( 'filestatus', 'escapenoentities' );
1202                         $copystatus =  htmlspecialchars( $this->mCopyrightStatus );
1203                         $filesource = wfMsgExt( 'filesource', 'escapenoentities' );
1204                         $uploadsource = htmlspecialchars( $this->mCopyrightSource );
1205
1206                         $wgOut->addHTML( "
1207                                         <td class='mw-label' style='white-space: nowrap;'>
1208                                                 <label for='wpUploadCopyStatus'>$filestatus</label></td>
1209                                         <td class='mw-input'>
1210                                                 <input tabindex='5' type='text' name='wpUploadCopyStatus' id='wpUploadCopyStatus'
1211                                                         value=\"$copystatus\" size='60' />
1212                                         </td>
1213                                 </tr>
1214                                 <tr>
1215                                         <td class='mw-label'>
1216                                                 <label for='wpUploadCopyStatus'>$filesource</label>
1217                                         </td>
1218                                         <td class='mw-input'>
1219                                                 <input tabindex='6' type='text' name='wpUploadSource' id='wpUploadCopyStatus'
1220                                                         value=\"$uploadsource\" size='60' />
1221                                         </td>
1222                                 </tr>
1223                                 <tr>"
1224                         );
1225                 }
1226
1227                 $wgOut->addHTML( "
1228                                 <td></td>
1229                                 <td>
1230                                         <input tabindex='7' type='checkbox' name='wpWatchthis' id='wpWatchthis' $watchChecked value='true' />
1231                                         <label for='wpWatchthis'>" . wfMsgHtml( 'watchthisupload' ) . "</label>
1232                                         <input tabindex='8' type='checkbox' name='wpIgnoreWarning' id='wpIgnoreWarning' value='true' $warningChecked />
1233                                         <label for='wpIgnoreWarning'>" . wfMsgHtml( 'ignorewarnings' ) . "</label>
1234                                 </td>
1235                         </tr>
1236                         $warningRow
1237                         <tr>
1238                                 <td></td>
1239                                         <td class='mw-input'>
1240                                                 <input tabindex='9' type='submit' name='wpUpload' value=\"{$ulb}\"" . $wgUser->getSkin()->tooltipAndAccesskey( 'upload' ) . " />
1241                                         </td>
1242                         </tr>
1243                         <tr>
1244                                 <td></td>
1245                                 <td class='mw-input'>"
1246                 );
1247                 $wgOut->addWikiText( wfMsgForContent( 'edittools' ) );
1248                 $wgOut->addHTML( "
1249                                 </td>
1250                         </tr>" .
1251                         Xml::closeElement( 'table' ) .
1252                         Xml::hidden( 'wpDestFileWarningAck', '', array( 'id' => 'wpDestFileWarningAck' ) ) .
1253                         xml::hidden( 'wpReUpload', $this->mReUpload ) .
1254                         Xml::closeElement( 'fieldset' ) .
1255                         Xml::closeElement( 'form' )
1256                 );
1257                 $uploadfooter = wfMsgNoTrans( 'uploadfooter' );
1258                 if( $uploadfooter != '-' && !wfEmptyMsg( 'uploadfooter', $uploadfooter ) ){
1259                         $wgOut->addWikiText( '<div id="mw-upload-footer-message">' . $uploadfooter . '</div>' );
1260                 }
1261         }
1262
1263         /* -------------------------------------------------------------- */
1264
1265         /**
1266          * See if we should check the 'watch this page' checkbox on the form
1267          * based on the user's preferences and whether we're being asked
1268          * to create a new file or update an existing one.
1269          *
1270          * In the case where 'watch edits' is off but 'watch creations' is on,
1271          * we'll leave the box unchecked.
1272          *
1273          * Note that the page target can be changed *on the form*, so our check
1274          * state can get out of sync.
1275          */
1276         function watchCheck() {
1277                 global $wgUser;
1278                 if( $wgUser->getOption( 'watchdefault' ) ) {
1279                         // Watch all edits!
1280                         return true;
1281                 }
1282
1283                 $local = wfLocalFile( $this->mDesiredDestName );
1284                 if( $local && $local->exists() ) {
1285                         // We're uploading a new version of an existing file.
1286                         // No creation, so don't watch it if we're not already.
1287                         return $local->getTitle()->userIsWatching();
1288                 } else {
1289                         // New page should get watched if that's our option.
1290                         return $wgUser->getOption( 'watchcreations' );
1291                 }
1292         }
1293
1294         /**
1295          * Split a file into a base name and all dot-delimited 'extensions'
1296          * on the end. Some web server configurations will fall back to
1297          * earlier pseudo-'extensions' to determine type and execute
1298          * scripts, so the blacklist needs to check them all.
1299          *
1300          * @return array
1301          */
1302         public function splitExtensions( $filename ) {
1303                 $bits = explode( '.', $filename );
1304                 $basename = array_shift( $bits );
1305                 return array( $basename, $bits );
1306         }
1307
1308         /**
1309          * Perform case-insensitive match against a list of file extensions.
1310          * Returns true if the extension is in the list.
1311          *
1312          * @param string $ext
1313          * @param array $list
1314          * @return bool
1315          */
1316         function checkFileExtension( $ext, $list ) {
1317                 return in_array( strtolower( $ext ), $list );
1318         }
1319
1320         /**
1321          * Perform case-insensitive match against a list of file extensions.
1322          * Returns true if any of the extensions are in the list.
1323          *
1324          * @param array $ext
1325          * @param array $list
1326          * @return bool
1327          */
1328         public function checkFileExtensionList( $ext, $list ) {
1329                 foreach( $ext as $e ) {
1330                         if( in_array( strtolower( $e ), $list ) ) {
1331                                 return true;
1332                         }
1333                 }
1334                 return false;
1335         }
1336
1337         /**
1338          * Verifies that it's ok to include the uploaded file
1339          *
1340          * @param string $tmpfile the full path of the temporary file to verify
1341          * @param string $extension The filename extension that the file is to be served with
1342          * @return mixed true of the file is verified, a WikiError object otherwise.
1343          */
1344         function verify( $tmpfile, $extension ) {
1345                 #magically determine mime type
1346                 $magic = MimeMagic::singleton();
1347                 $mime = $magic->guessMimeType($tmpfile,false);
1348
1349
1350                 #check mime type, if desired
1351                 global $wgVerifyMimeType;
1352                 if ($wgVerifyMimeType) {
1353                         wfDebug ( "\n\nmime: <$mime> extension: <$extension>\n\n");
1354                         #check mime type against file extension
1355                         if( !self::verifyExtension( $mime, $extension ) ) {
1356                                 return new WikiErrorMsg( 'uploadcorrupt' );
1357                         }
1358
1359                         #check mime type blacklist
1360                         global $wgMimeTypeBlacklist;
1361                         if( isset($wgMimeTypeBlacklist) && !is_null($wgMimeTypeBlacklist) ) {
1362                                 if ( $this->checkFileExtension( $mime, $wgMimeTypeBlacklist ) ) {
1363                                         return new WikiErrorMsg( 'filetype-badmime', htmlspecialchars( $mime ) );
1364                                 }
1365
1366                                 # Check IE type
1367                                 $fp = fopen( $tmpfile, 'rb' );
1368                                 $chunk = fread( $fp, 256 );
1369                                 fclose( $fp );
1370                                 $extMime = $magic->guessTypesForExtension( $extension );
1371                                 $ieTypes = $magic->getIEMimeTypes( $tmpfile, $chunk, $extMime );
1372                                 foreach ( $ieTypes as $ieType ) {
1373                                         if ( $this->checkFileExtension( $ieType, $wgMimeTypeBlacklist ) ) {
1374                                                 return new WikiErrorMsg( 'filetype-bad-ie-mime', $ieType );
1375                                         }
1376                                 }
1377                         }
1378                 }
1379
1380                 #check for htmlish code and javascript
1381                 if( $this->detectScript ( $tmpfile, $mime, $extension ) ) {
1382                         return new WikiErrorMsg( 'uploadscripted' );
1383                 }
1384                 if( $extension == 'svg' || $mime == 'image/svg+xml' ) {
1385                         if( $this->detectScriptInSvg( $tmpfile ) ) {
1386                                 return new WikiErrorMsg( 'uploadscripted' );
1387                         }
1388                 }
1389
1390                 /**
1391                 * Scan the uploaded file for viruses
1392                 */
1393                 $virus= $this->detectVirus($tmpfile);
1394                 if ( $virus ) {
1395                         return new WikiErrorMsg( 'uploadvirus', htmlspecialchars($virus) );
1396                 }
1397
1398                 wfDebug( __METHOD__.": all clear; passing.\n" );
1399                 return true;
1400         }
1401
1402         /**
1403          * Checks if the mime type of the uploaded file matches the file extension.
1404          *
1405          * @param string $mime the mime type of the uploaded file
1406          * @param string $extension The filename extension that the file is to be served with
1407          * @return bool
1408          */
1409         static function verifyExtension( $mime, $extension ) {
1410                 $magic = MimeMagic::singleton();
1411
1412                 if ( ! $mime || $mime == 'unknown' || $mime == 'unknown/unknown' )
1413                         if ( ! $magic->isRecognizableExtension( $extension ) ) {
1414                                 wfDebug( __METHOD__.": passing file with unknown detected mime type; " .
1415                                         "unrecognized extension '$extension', can't verify\n" );
1416                                 return true;
1417                         } else {
1418                                 wfDebug( __METHOD__.": rejecting file with unknown detected mime type; ".
1419                                         "recognized extension '$extension', so probably invalid file\n" );
1420                                 return false;
1421                         }
1422
1423                 $match= $magic->isMatchingExtension($extension,$mime);
1424
1425                 if ($match===NULL) {
1426                         wfDebug( __METHOD__.": no file extension known for mime type $mime, passing file\n" );
1427                         return true;
1428                 } elseif ($match===true) {
1429                         wfDebug( __METHOD__.": mime type $mime matches extension $extension, passing file\n" );
1430
1431                         #TODO: if it's a bitmap, make sure PHP or ImageMagic resp. can handle it!
1432                         return true;
1433
1434                 } else {
1435                         wfDebug( __METHOD__.": mime type $mime mismatches file extension $extension, rejecting file\n" );
1436                         return false;
1437                 }
1438         }
1439
1440
1441         /**
1442          * Heuristic for detecting files that *could* contain JavaScript instructions or
1443          * things that may look like HTML to a browser and are thus
1444          * potentially harmful. The present implementation will produce false positives in some situations.
1445          *
1446          * @param string $file Pathname to the temporary upload file
1447          * @param string $mime The mime type of the file
1448          * @param string $extension The extension of the file
1449          * @return bool true if the file contains something looking like embedded scripts
1450          */
1451         function detectScript($file, $mime, $extension) {
1452                 global $wgAllowTitlesInSVG;
1453
1454                 #ugly hack: for text files, always look at the entire file.
1455                 #For binarie field, just check the first K.
1456
1457                 if (strpos($mime,'text/')===0) $chunk = file_get_contents( $file );
1458                 else {
1459                         $fp = fopen( $file, 'rb' );
1460                         $chunk = fread( $fp, 1024 );
1461                         fclose( $fp );
1462                 }
1463
1464                 $chunk= strtolower( $chunk );
1465
1466                 if (!$chunk) return false;
1467
1468                 #decode from UTF-16 if needed (could be used for obfuscation).
1469                 if (substr($chunk,0,2)=="\xfe\xff") $enc= "UTF-16BE";
1470                 elseif (substr($chunk,0,2)=="\xff\xfe") $enc= "UTF-16LE";
1471                 else $enc= NULL;
1472
1473                 if ($enc) $chunk= iconv($enc,"ASCII//IGNORE",$chunk);
1474
1475                 $chunk= trim($chunk);
1476
1477                 #FIXME: convert from UTF-16 if necessarry!
1478
1479                 wfDebug("SpecialUpload::detectScript: checking for embedded scripts and HTML stuff\n");
1480
1481                 #check for HTML doctype
1482                 if (eregi("<!DOCTYPE *X?HTML",$chunk)) return true;
1483
1484                 /**
1485                 * Internet Explorer for Windows performs some really stupid file type
1486                 * autodetection which can cause it to interpret valid image files as HTML
1487                 * and potentially execute JavaScript, creating a cross-site scripting
1488                 * attack vectors.
1489                 *
1490                 * Apple's Safari browser also performs some unsafe file type autodetection
1491                 * which can cause legitimate files to be interpreted as HTML if the
1492                 * web server is not correctly configured to send the right content-type
1493                 * (or if you're really uploading plain text and octet streams!)
1494                 *
1495                 * Returns true if IE is likely to mistake the given file for HTML.
1496                 * Also returns true if Safari would mistake the given file for HTML
1497                 * when served with a generic content-type.
1498                 */
1499
1500                 $tags = array(
1501                         '<a href',
1502                         '<body',
1503                         '<head',
1504                         '<html',   #also in safari
1505                         '<img',
1506                         '<pre',
1507                         '<script', #also in safari
1508                         '<table'
1509                         );
1510                 if( ! $wgAllowTitlesInSVG && $extension !== 'svg' && $mime !== 'image/svg' ) {
1511                         $tags[] = '<title';
1512                 }
1513
1514                 foreach( $tags as $tag ) {
1515                         if( false !== strpos( $chunk, $tag ) ) {
1516                                 return true;
1517                         }
1518                 }
1519
1520                 /*
1521                 * look for javascript
1522                 */
1523
1524                 #resolve entity-refs to look at attributes. may be harsh on big files... cache result?
1525                 $chunk = Sanitizer::decodeCharReferences( $chunk );
1526
1527                 #look for script-types
1528                 if (preg_match('!type\s*=\s*[\'"]?\s*(?:\w*/)?(?:ecma|java)!sim',$chunk)) return true;
1529
1530                 #look for html-style script-urls
1531                 if (preg_match('!(?:href|src|data)\s*=\s*[\'"]?\s*(?:ecma|java)script:!sim',$chunk)) return true;
1532
1533                 #look for css-style script-urls
1534                 if (preg_match('!url\s*\(\s*[\'"]?\s*(?:ecma|java)script:!sim',$chunk)) return true;
1535
1536                 wfDebug("SpecialUpload::detectScript: no scripts found\n");
1537                 return false;
1538         }
1539
1540         function detectScriptInSvg( $filename ) {
1541                 $check = new XmlTypeCheck( $filename, array( $this, 'checkSvgScriptCallback' ) );
1542                 return $check->filterMatch;
1543         }
1544
1545         /**
1546          * @todo Replace this with a whitelist filter!
1547          */
1548         function checkSvgScriptCallback( $element, $attribs ) {
1549                 $stripped = $this->stripXmlNamespace( $element );
1550
1551                 if( $stripped == 'script' ) {
1552                         wfDebug( __METHOD__ . ": Found script element '$element' in uploaded file.\n" );
1553                         return true;
1554                 }
1555
1556                 foreach( $attribs as $attrib => $value ) {
1557                         $stripped = $this->stripXmlNamespace( $attrib );
1558                         if( substr( $stripped, 0, 2 ) == 'on' ) {
1559                                 wfDebug( __METHOD__ . ": Found script attribute '$attrib'='value' in uploaded file.\n" );
1560                                 return true;
1561                         }
1562                         if( $stripped == 'href' && strpos( strtolower( $value ), 'javascript:' ) !== false ) {
1563                                 wfDebug( __METHOD__ . ": Found script href attribute '$attrib'='$value' in uploaded file.\n" );
1564                                 return true;
1565                         }
1566                 }
1567         }
1568
1569         private function stripXmlNamespace( $name ) {
1570                 // 'http://www.w3.org/2000/svg:script' -> 'script'
1571                 $parts = explode( ':', strtolower( $name ) );
1572                 return array_pop( $parts );
1573         }
1574
1575         /**
1576          * Generic wrapper function for a virus scanner program.
1577          * This relies on the $wgAntivirus and $wgAntivirusSetup variables.
1578          * $wgAntivirusRequired may be used to deny upload if the scan fails.
1579          *
1580          * @param string $file Pathname to the temporary upload file
1581          * @return mixed false if not virus is found, NULL if the scan fails or is disabled,
1582          *         or a string containing feedback from the virus scanner if a virus was found.
1583          *         If textual feedback is missing but a virus was found, this function returns true.
1584          */
1585         function detectVirus($file) {
1586                 global $wgAntivirus, $wgAntivirusSetup, $wgAntivirusRequired, $wgOut;
1587
1588                 if ( !$wgAntivirus ) {
1589                         wfDebug( __METHOD__.": virus scanner disabled\n");
1590                         return NULL;
1591                 }
1592
1593                 if ( !$wgAntivirusSetup[$wgAntivirus] ) {
1594                         wfDebug( __METHOD__.": unknown virus scanner: $wgAntivirus\n" );
1595                         $wgOut->wrapWikiMsg( '<div class="error">$1</div>', array( 'virus-badscanner', $wgAntivirus ) );
1596                         return wfMsg('virus-unknownscanner') . " $wgAntivirus";
1597                 }
1598
1599                 # look up scanner configuration
1600                 $command = $wgAntivirusSetup[$wgAntivirus]["command"];
1601                 $exitCodeMap = $wgAntivirusSetup[$wgAntivirus]["codemap"];
1602                 $msgPattern = isset( $wgAntivirusSetup[$wgAntivirus]["messagepattern"] ) ?
1603                         $wgAntivirusSetup[$wgAntivirus]["messagepattern"] : null;
1604
1605                 if ( strpos( $command,"%f" ) === false ) {
1606                         # simple pattern: append file to scan
1607                         $command .= " " . wfEscapeShellArg( $file );
1608                 } else {
1609                         # complex pattern: replace "%f" with file to scan
1610                         $command = str_replace( "%f", wfEscapeShellArg( $file ), $command );
1611                 }
1612
1613                 wfDebug( __METHOD__.": running virus scan: $command \n" );
1614
1615                 # execute virus scanner
1616                 $exitCode = false;
1617
1618                 #NOTE: there's a 50 line workaround to make stderr redirection work on windows, too.
1619                 #      that does not seem to be worth the pain.
1620                 #      Ask me (Duesentrieb) about it if it's ever needed.
1621                 $output = array();
1622                 if ( wfIsWindows() ) {
1623                         exec( "$command", $output, $exitCode );
1624                 } else {
1625                         exec( "$command 2>&1", $output, $exitCode );
1626                 }
1627
1628                 # map exit code to AV_xxx constants.
1629                 $mappedCode = $exitCode;
1630                 if ( $exitCodeMap ) {
1631                         if ( isset( $exitCodeMap[$exitCode] ) ) {
1632                                 $mappedCode = $exitCodeMap[$exitCode];
1633                         } elseif ( isset( $exitCodeMap["*"] ) ) {
1634                                 $mappedCode = $exitCodeMap["*"];
1635                         }
1636                 }
1637
1638                 if ( $mappedCode === AV_SCAN_FAILED ) {
1639                         # scan failed (code was mapped to false by $exitCodeMap)
1640                         wfDebug( __METHOD__.": failed to scan $file (code $exitCode).\n" );
1641
1642                         if ( $wgAntivirusRequired ) {
1643                                 return wfMsg('virus-scanfailed', array( $exitCode ) );
1644                         } else {
1645                                 return NULL;
1646                         }
1647                 } else if ( $mappedCode === AV_SCAN_ABORTED ) {
1648                         # scan failed because filetype is unknown (probably imune)
1649                         wfDebug( __METHOD__.": unsupported file type $file (code $exitCode).\n" );
1650                         return NULL;
1651                 } else if ( $mappedCode === AV_NO_VIRUS ) {
1652                         # no virus found
1653                         wfDebug( __METHOD__.": file passed virus scan.\n" );
1654                         return false;
1655                 } else {
1656                         $output = join( "\n", $output );
1657                         $output = trim( $output );
1658
1659                         if ( !$output ) {
1660                                 $output = true; #if there's no output, return true
1661                         } elseif ( $msgPattern ) {
1662                                 $groups = array();
1663                                 if ( preg_match( $msgPattern, $output, $groups ) ) {
1664                                         if ( $groups[1] ) {
1665                                                 $output = $groups[1];
1666                                         }
1667                                 }
1668                         }
1669
1670                         wfDebug( __METHOD__.": FOUND VIRUS! scanner feedback: $output \n" );
1671                         return $output;
1672                 }
1673         }
1674
1675         /**
1676          * Check if the temporary file is MacBinary-encoded, as some uploads
1677          * from Internet Explorer on Mac OS Classic and Mac OS X will be.
1678          * If so, the data fork will be extracted to a second temporary file,
1679          * which will then be checked for validity and either kept or discarded.
1680          *
1681          * @access private
1682          */
1683         function checkMacBinary() {
1684                 $macbin = new MacBinary( $this->mTempPath );
1685                 if( $macbin->isValid() ) {
1686                         $dataFile = tempnam( wfTempDir(), "WikiMacBinary" );
1687                         $dataHandle = fopen( $dataFile, 'wb' );
1688
1689                         wfDebug( "SpecialUpload::checkMacBinary: Extracting MacBinary data fork to $dataFile\n" );
1690                         $macbin->extractData( $dataHandle );
1691
1692                         $this->mTempPath = $dataFile;
1693                         $this->mFileSize = $macbin->dataForkLength();
1694
1695                         // We'll have to manually remove the new file if it's not kept.
1696                         $this->mRemoveTempFile = true;
1697                 }
1698                 $macbin->close();
1699         }
1700
1701         /**
1702          * If we've modified the upload file we need to manually remove it
1703          * on exit to clean up.
1704          * @access private
1705          */
1706         function cleanupTempFile() {
1707                 if ( $this->mRemoveTempFile && $this->mTempPath && file_exists( $this->mTempPath ) ) {
1708                         wfDebug( "SpecialUpload::cleanupTempFile: Removing temporary file {$this->mTempPath}\n" );
1709                         unlink( $this->mTempPath );
1710                 }
1711         }
1712
1713         /**
1714          * Check if there's an overwrite conflict and, if so, if restrictions
1715          * forbid this user from performing the upload.
1716          *
1717          * @return mixed true on success, WikiError on failure
1718          * @access private
1719          */
1720         function checkOverwrite( $name ) {
1721                 $img = wfFindFile( $name );
1722
1723                 $error = '';
1724                 if( $img ) {
1725                         global $wgUser, $wgOut;
1726                         if( $img->isLocal() ) {
1727                                 if( !self::userCanReUpload( $wgUser, $img->name ) ) {
1728                                         $error = 'fileexists-forbidden';
1729                                 }
1730                         } else {
1731                                 if( !$wgUser->isAllowed( 'reupload' ) ||
1732                                     !$wgUser->isAllowed( 'reupload-shared' ) ) {
1733                                         $error = "fileexists-shared-forbidden";
1734                                 }
1735                         }
1736                 }
1737
1738                 if( $error ) {
1739                         $errorText = wfMsg( $error, wfEscapeWikiText( $img->getName() ) );
1740                         return $errorText;
1741                 }
1742
1743                 // Rockin', go ahead and upload
1744                 return true;
1745         }
1746
1747          /**
1748          * Check if a user is the last uploader
1749          *
1750          * @param User $user
1751          * @param string $img, image name
1752          * @return bool
1753          */
1754         public static function userCanReUpload( User $user, $img ) {
1755                 if( $user->isAllowed( 'reupload' ) )
1756                         return true; // non-conditional
1757                 if( !$user->isAllowed( 'reupload-own' ) )
1758                         return false;
1759
1760                 $dbr = wfGetDB( DB_SLAVE );
1761                 $row = $dbr->selectRow('image',
1762                 /* SELECT */ 'img_user',
1763                 /* WHERE */ array( 'img_name' => $img )
1764                 );
1765                 if ( !$row )
1766                         return false;
1767
1768                 return $user->getId() == $row->img_user;
1769         }
1770
1771         /**
1772          * Display an error with a wikitext description
1773          */
1774         function showError( $description ) {
1775                 global $wgOut;
1776                 $wgOut->setPageTitle( wfMsg( "internalerror" ) );
1777                 $wgOut->setRobotPolicy( "noindex,nofollow" );
1778                 $wgOut->setArticleRelated( false );
1779                 $wgOut->enableClientCache( false );
1780                 $wgOut->addWikiText( $description );
1781         }
1782
1783         /**
1784          * Get the initial image page text based on a comment and optional file status information
1785          */
1786         static function getInitialPageText( $comment, $license, $copyStatus, $source ) {
1787                 global $wgUseCopyrightUpload;
1788                 if ( $wgUseCopyrightUpload ) {
1789                         if ( $license != '' ) {
1790                                 $licensetxt = '== ' . wfMsgForContent( 'license' ) . " ==\n" . '{{' . $license . '}}' . "\n";
1791                         }
1792                         $pageText = '== ' . wfMsg ( 'filedesc' ) . " ==\n" . $comment . "\n" .
1793                           '== ' . wfMsgForContent ( 'filestatus' ) . " ==\n" . $copyStatus . "\n" .
1794                           "$licensetxt" .
1795                           '== ' . wfMsgForContent ( 'filesource' ) . " ==\n" . $source ;
1796                 } else {
1797                         if ( $license != '' ) {
1798                                 $filedesc = $comment == '' ? '' : '== ' . wfMsg ( 'filedesc' ) . " ==\n" . $comment . "\n";
1799                                  $pageText = $filedesc .
1800                                          '== ' . wfMsgForContent ( 'license' ) . " ==\n" . '{{' . $license . '}}' . "\n";
1801                         } else {
1802                                 $pageText = $comment;
1803                         }
1804                 }
1805                 return $pageText;
1806         }
1807
1808         /**
1809          * If there are rows in the deletion log for this file, show them,
1810          * along with a nice little note for the user
1811          *
1812          * @param OutputPage $out
1813          * @param string filename
1814          */
1815         private function showDeletionLog( $out, $filename ) {
1816                 global $wgUser;
1817                 $loglist = new LogEventsList( $wgUser->getSkin(), $out );
1818                 $pager = new LogPager( $loglist, 'delete', false, $filename );
1819                 if( $pager->getNumRows() > 0 ) {
1820                         $out->addHTML( '<div class="mw-warning-with-logexcerpt">' );
1821                         $out->addWikiMsg( 'upload-wasdeleted' );
1822                         $out->addHTML(
1823                                 $loglist->beginLogEventsList() .
1824                                 $pager->getBody() .
1825                                 $loglist->endLogEventsList()
1826                         );
1827                         $out->addHTML( '</div>' );
1828                 }
1829         }
1830 }