+ $headers = array(); // HTTP headers to send
+
+ $fileName = isset( $params['f'] ) ? $params['f'] : '';
+ unset( $params['f'] );
+
+ // Backwards compatibility parameters
+ if ( isset( $params['w'] ) ) {
+ $params['width'] = $params['w'];
+ unset( $params['w'] );
+ }
+ if ( isset( $params['p'] ) ) {
+ $params['page'] = $params['p'];
+ }
+ unset( $params['r'] ); // ignore 'r' because we unconditionally pass File::RENDER
+
+ // Is this a thumb of an archived file?
+ $isOld = ( isset( $params['archived'] ) && $params['archived'] );
+ unset( $params['archived'] );
+
+ // Some basic input validation
+ $fileName = strtr( $fileName, '\\/', '__' );
+
+ // Actually fetch the image. Method depends on whether it is archived or not.
+ if ( $isOld ) {
+ // Format is <timestamp>!<name>
+ $bits = explode( '!', $fileName, 2 );
+ if ( count( $bits ) != 2 ) {
+ wfThumbError( 404, wfMsg( 'badtitletext' ) );
+ wfProfileOut( __METHOD__ );
+ return;
+ }
+ $title = Title::makeTitleSafe( NS_FILE, $bits[1] );
+ if ( !$title ) {
+ wfThumbError( 404, wfMsg( 'badtitletext' ) );
+ wfProfileOut( __METHOD__ );
+ return;
+ }
+ $img = RepoGroup::singleton()->getLocalRepo()->newFromArchiveName( $title, $fileName );
+ } else {
+ $img = wfLocalFile( $fileName );
+ }
+
+ // Check permissions if there are read restrictions
+ if ( !in_array( 'read', User::getGroupPermissions( array( '*' ) ), true ) ) {
+ if ( !$img->getTitle() || !$img->getTitle()->userCan( 'read' ) ) {
+ wfThumbError( 403, 'Access denied. You do not have permission to access ' .
+ 'the source file.' );
+ wfProfileOut( __METHOD__ );
+ return;
+ }
+ $headers[] = 'Cache-Control: private';
+ $headers[] = 'Vary: Cookie';
+ }
+
+ // Check the source file storage path
+ if ( !$img ) {
+ wfThumbError( 404, wfMsg( 'badtitletext' ) );
+ wfProfileOut( __METHOD__ );
+ return;
+ }
+ if ( !$img->exists() ) {
+ wfThumbError( 404, 'The source file for the specified thumbnail does not exist.' );
+ wfProfileOut( __METHOD__ );
+ return;
+ }
+ $sourcePath = $img->getPath();
+ if ( $sourcePath === false ) {
+ wfThumbError( 500, 'The source file is not locally accessible.' );
+ wfProfileOut( __METHOD__ );
+ return;
+ }
+
+ // Check IMS against the source file
+ // This means that clients can keep a cached copy even after it has been deleted on the server
+ if ( !empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
+ // Fix IE brokenness
+ $imsString = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
+ // Calculate time
+ wfSuppressWarnings();
+ $imsUnix = strtotime( $imsString );
+ wfRestoreWarnings();
+ $sourceTsUnix = wfTimestamp( TS_UNIX, $img->getTimestamp() );
+ if ( $sourceTsUnix <= $imsUnix ) {
+ header( 'HTTP/1.1 304 Not Modified' );
+ wfProfileOut( __METHOD__ );
+ return;
+ }
+ }
+
+ // Stream the file if it exists already...
+ try {
+ $thumbName = $img->thumbName( $params );
+ if ( strlen( $thumbName ) ) { // valid params?
+ // For 404 handled thumbnails, we only use the the base name of the URI
+ // for the thumb params and the parent directory for the source file name.
+ // Check that the zone relative path matches up so squid caches won't pick
+ // up thumbs that would not be purged on source file deletion (bug 34231).
+ if ( isset( $params['rel404'] ) // thumbnail was handled via 404
+ && urldecode( $params['rel404'] ) !== $img->getThumbRel( $thumbName ) )
+ {
+ wfThumbError( 404, 'The source file for the specified thumbnail does not exist.' );
+ wfProfileOut( __METHOD__ );
+ return;
+ }
+ $thumbPath = $img->getThumbPath( $thumbName );
+ if ( $img->getRepo()->fileExists( $thumbPath ) ) {
+ $img->getRepo()->streamFile( $thumbPath, $headers );
+ wfProfileOut( __METHOD__ );
+ return;
+ }
+ }
+ } catch ( MWException $e ) {
+ wfThumbError( 500, $e->getHTML() );
+ wfProfileOut( __METHOD__ );
+ return;
+ }
+
+ // Thumbnail isn't already there, so create the new thumbnail...
+ try {
+ $thumb = $img->transform( $params, File::RENDER_NOW );
+ } catch ( Exception $ex ) {
+ // Tried to select a page on a non-paged file?
+ $thumb = false;
+ }
+
+ // Check for thumbnail generation errors...
+ $errorMsg = false;
+ if ( !$thumb ) {
+ $errorMsg = wfMsgHtml( 'thumbnail_error', 'File::transform() returned false' );
+ } elseif ( $thumb->isError() ) {
+ $errorMsg = $thumb->getHtmlMsg();
+ } elseif ( !$thumb->hasFile() ) {
+ $errorMsg = wfMsgHtml( 'thumbnail_error', 'No path supplied in thumbnail object' );
+ } elseif ( $thumb->fileIsSource() ) {
+ $errorMsg = wfMsgHtml( 'thumbnail_error',
+ 'Image was not scaled, is the requested width bigger than the source?' );
+ }
+
+ if ( $errorMsg !== false ) {
+ wfThumbError( 500, $errorMsg );
+ } else {
+ // Stream the file if there were no errors
+ $thumb->streamFile( $headers );
+ }
+
+ wfProfileOut( __METHOD__ );