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