    001// Copyright 2007, 2008, 2010, 2011 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.tapestry5.upload.internal.services;
    016
    017import org.apache.commons.fileupload.FileItem;
    018import org.apache.commons.fileupload.FileItemFactory;
    019import org.apache.commons.fileupload.FileUploadException;
    020import org.apache.commons.fileupload.servlet.ServletFileUpload;
    021import org.apache.tapestry5.SymbolConstants;
    022import org.apache.tapestry5.ioc.annotations.Symbol;
    023import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
    024import org.apache.tapestry5.ioc.services.ThreadCleanupListener;
    025import org.apache.tapestry5.upload.services.MultipartDecoder;
    026import org.apache.tapestry5.upload.services.UploadSymbols;
    027import org.apache.tapestry5.upload.services.UploadedFile;
    028
    029import javax.servlet.http.HttpServletRequest;
    030import java.io.UnsupportedEncodingException;
    031import java.util.Collections;
    032import java.util.List;
    033import java.util.Map;
    034
    035/**
    036 * Implementation of multipart decoder for servlets. This implementation is perthread scope.
    037 */
    038public class MultipartDecoderImpl implements MultipartDecoder, ThreadCleanupListener
    039{
    040    private final Map<String, UploadedFileItem> uploads = CollectionFactory.newMap();
    041
    042    private final FileItemFactory fileItemFactory;
    043
    044    private final long maxRequestSize;
    045
    046    private final long maxFileSize;
    047
    048    private final String requestEncoding;
    049
    050    private FileUploadException uploadException;
    051
    052    public MultipartDecoderImpl(
    053
    054            FileItemFactory fileItemFactory,
    055
    056            @Symbol(UploadSymbols.REQUESTSIZE_MAX)
    057            long maxRequestSize,
    058
    059            @Symbol(UploadSymbols.FILESIZE_MAX)
    060            long maxFileSize,
    061
    062            @Symbol(SymbolConstants.CHARSET)
    063            String requestEncoding)
    064    {
    065        this.fileItemFactory = fileItemFactory;
    066        this.maxRequestSize = maxRequestSize;
    067        this.maxFileSize = maxFileSize;
    068        this.requestEncoding = requestEncoding;
    069    }
    070
    071    @Override
    072    public UploadedFile getFileUpload(String parameterName)
    073    {
    074        return uploads.get(parameterName);
    075    }
    076
    077    @Override
    078    public HttpServletRequest decode(HttpServletRequest request)
    079    {
    080        try
    081        {
    082            request.setCharacterEncoding(requestEncoding);
    083        } catch (UnsupportedEncodingException ex)
    084        {
    085            throw new RuntimeException(ex);
    086        }
    087
    088        List<FileItem> fileItems = parseRequest(request);
    089
    090        return processFileItems(request, fileItems);
    091    }
    092
    093    @Override
    094    public void threadDidCleanup()
    095    {
    096        for (UploadedFileItem uploaded : uploads.values())
    097        {
    098            uploaded.cleanup();
    099        }
    100    }
    101
    102    protected List<FileItem> parseRequest(HttpServletRequest request)
    103    {
    104        try
    105        {
    106            return createFileUpload().parseRequest(request);
    107        } catch (FileUploadException ex)
    108        {
    109            uploadException = ex;
    110
    111            return Collections.emptyList();
    112        }
    113    }
    114
    115    protected ServletFileUpload createFileUpload()
    116    {
    117        ServletFileUpload upload = new ServletFileUpload(fileItemFactory);
    118
    119        // set maximum file upload size
    120        upload.setSizeMax(maxRequestSize);
    121        upload.setFileSizeMax(maxFileSize);
    122
    123        return upload;
    124    }
    125
    126    protected HttpServletRequest processFileItems(HttpServletRequest request, List<FileItem> fileItems)
    127    {
    128        if (uploadException == null && fileItems.isEmpty())
    129        {
    130            return request;
    131        }
    132
    133        ParametersServletRequestWrapper wrapper = new ParametersServletRequestWrapper(request);
    134
    135        // First add parameters from the request
    136        for (Map.Entry<String, String[]> e : request.getParameterMap().entrySet())
    137        {
    138            for (String s : e.getValue())
    139                wrapper.addParameter(e.getKey(), s);
    140        }
    141
    142        for (FileItem item : fileItems)
    143        {
    144            if (item.isFormField())
    145            {
    146                String fieldValue;
    147
    148                try
    149                {
    150
    151                    fieldValue = item.getString(requestEncoding);
    152                } catch (UnsupportedEncodingException ex)
    153                {
    154                    throw new RuntimeException(ex);
    155                }
    156
    157                wrapper.addParameter(item.getFieldName(), fieldValue);
    158            } else
    159            {
    160                wrapper.addParameter(item.getFieldName(), item.getName());
    161                addUploadedFile(item.getFieldName(), new UploadedFileItem(item));
    162            }
    163        }
    164
    165        return wrapper;
    166    }
    167
    168    protected void addUploadedFile(String name, UploadedFileItem file)
    169    {
    170        uploads.put(name, file);
    171    }
    172
    173    @Override
    174    public FileUploadException getUploadException()
    175    {
    176        return uploadException;
    177    }
    178}