com.corejsf.UploadFilter.java Source code

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Here is the source code for com.corejsf.UploadFilter.java

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/**********************************************************************************
* $URL$
* $Id$
***********************************************************************************
* Copyright (c) 2004 Sun Microsystems from the Java Series, Core Java ServerFaces
* source freely distributable.
* see http://www.sun.com/books/java_series.html
 ***********************************************************************************
* Modifications Copyright (c) 2005, 2006 Sakai Foundation
*
* Licensed under the Educational Community License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*       http://www.opensource.org/licenses/ECL-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
**********************************************************************************/
package com.corejsf;

import java.io.IOException;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import org.apache.commons.fileupload.DiskFileUpload;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUpload;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.sakaiproject.component.cover.ServerConfigurationService;

public class UploadFilter implements Filter {
    private static Log log = LogFactory.getLog(UploadFilter.class);

    private int sizeThreshold = -1;
    private long sizeMax = -1;
    private String repositoryPath;
    private String saveMediaToDb = "false";

    public void init(FilterConfig config) throws ServletException {
        repositoryPath = ServerConfigurationService.getString("samigo.answerUploadRepositoryPath",
                "${sakai.home}/samigo/answerUploadRepositoryPath/");

        try {
            String paramValue = ServerConfigurationService.getString("samigo.sizeThreshold", "1024");
            if (paramValue != null)
                sizeThreshold = Integer.parseInt(paramValue);

            paramValue = ServerConfigurationService.getString("samigo.sizeMax", "40960");
            if (paramValue != null)
                sizeMax = Long.parseLong(paramValue);

            paramValue = ServerConfigurationService.getString("samigo.saveMediaToDb", "true");
            if (paramValue != null)
                saveMediaToDb = paramValue;

            //System.out.println("**** repositoryPath="+repositoryPath);
            //System.out.println("**** sabeMediaToDb="+saveMediaToDb);
            //System.out.println("**** sizeThreshold="+sizeThreshold);
            //System.out.println("**** sizeMax="+sizeMax);
        } catch (NumberFormatException ex) {
            ServletException servletEx = new ServletException();
            servletEx.initCause(ex);
            throw servletEx;
        }
        ServletContext context = config.getServletContext();
        context.setAttribute("FILEUPLOAD_REPOSITORY_PATH", repositoryPath);
        context.setAttribute("FILEUPLOAD_SIZE_THRESHOLD", Integer.valueOf(sizeThreshold));
        context.setAttribute("FILEUPLOAD_SIZE_MAX", Long.valueOf(sizeMax));
        context.setAttribute("FILEUPLOAD_SAVE_MEDIA_TO_DB", saveMediaToDb);
    }

    public void destroy() {
    }

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {

        //System.out.println("**** doFilter #1");
        if (!(request instanceof HttpServletRequest)) {
            chain.doFilter(request, response);
            return;
        }

        //System.out.println("**** doFilter #2");
        HttpServletRequest httpRequest = (HttpServletRequest) request;
        boolean isMultipartContent = FileUpload.isMultipartContent(httpRequest);
        if (!isMultipartContent) {
            chain.doFilter(request, response);
            return;
        }

        //System.out.println("**** doFilter #3");
        DiskFileUpload upload = new DiskFileUpload();
        if (repositoryPath != null)
            upload.setRepositoryPath(repositoryPath);

        try {
            List list = upload.parseRequest(httpRequest);
            final Map map = new HashMap();
            for (int i = 0; i < list.size(); i++) {
                FileItem item = (FileItem) list.get(i);
                //System.out.println("form filed="+item.getFieldName()+" : "+str);
                if (item.isFormField()) {
                    String str = item.getString("UTF-8");
                    map.put(item.getFieldName(), new String[] { str });
                } else {
                    httpRequest.setAttribute(item.getFieldName(), item);
                }
            }

            chain.doFilter(new HttpServletRequestWrapper(httpRequest) {
                public Map getParameterMap() {
                    return map;
                }

                // busywork follows ... should have been part of the wrapper
                public String[] getParameterValues(String name) {
                    Map map = getParameterMap();
                    return (String[]) map.get(name);
                }

                public String getParameter(String name) {
                    String[] params = getParameterValues(name);
                    if (params == null)
                        return null;
                    return params[0];
                }

                public Enumeration getParameterNames() {
                    Map map = getParameterMap();
                    return Collections.enumeration(map.keySet());
                }
            }, response);
        } catch (FileUploadException ex) {
            log.error(ex.getMessage());
            ServletException servletEx = new ServletException();
            servletEx.initCause(ex);
            throw servletEx;
        }
    }
}