001// Copyright 2005 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007//     http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.tapestry.multipart;
016
017import java.io.IOException;
018
019import javax.servlet.ServletException;
020import javax.servlet.http.HttpServletRequest;
021import javax.servlet.http.HttpServletResponse;
022
023import org.apache.tapestry.services.ServletRequestServicer;
024import org.apache.tapestry.services.ServletRequestServicerFilter;
025
026/**
027 * Checks to see if the request is a file upload and, if so, uses the
028 * {@link org.apache.tapestry.multipart.MultipartDecoder} to obtain form parameters.
029 * 
030 * @author Howard M. Lewis Ship
031 * @since 4.0
032 */
033public class MultipartDecoderFilter implements ServletRequestServicerFilter
034{
035    private ServletMultipartDecoder _decoder;
036    
037    public void service(HttpServletRequest request, HttpServletResponse response,
038            ServletRequestServicer servicer) throws IOException, ServletException
039    {
040        String contentType = request.getContentType();
041
042        // contentType is occasionally null in testing. The browser tacks on additional
043        // information onto the contentType to indicate where the boundaries are in
044        // the stream.
045
046        boolean encoded = contentType != null && contentType.startsWith("multipart/form-data");
047
048        try
049        {
050            HttpServletRequest newRequest = encoded ? _decoder.decode(request) : request;
051            
052            servicer.service(newRequest, response);
053        }
054        finally
055        {
056            if (encoded)
057                _decoder.cleanup();
058        }
059    }
060
061    public void setDecoder(ServletMultipartDecoder decoder)
062    {
063        _decoder = decoder;
064    }
065}