org.sakaiproject.tool.syllabus.FileUploadFilter.java Source code

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Here is the source code for org.sakaiproject.tool.syllabus.FileUploadFilter.java

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/**********************************************************************************
 * $URL$
 * $Id$
 ***********************************************************************************
 *
 * Copyright (c) 2003, 2004, 2005, 2006, 2008 The 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 org.sakaiproject.tool.syllabus;

import java.io.FileWriter;
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.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;

public class FileUploadFilter implements Filter {
    protected int sizeThreshold = 2;
    protected long sizeMax = 2048;
    private String repositoryPath = "/fileUpload";
    private FileWriter fw;

    public void init(FilterConfig config) throws ServletException {
        repositoryPath = config.getInitParameter("org.sakaiproject.tool.syllabus.FileUploadFilter.repositoryPath");

        try {
            String paramValue = config
                    .getInitParameter("org.sakaiproject.tool.syllabus.FileUploadFilter.sizeThreshold");

            if (paramValue != null)
                sizeThreshold = Integer.parseInt(paramValue);
            paramValue = config.getInitParameter("org.sakaiproject.tool.syllabus.FileUploadFilter.sizeMax");
            if (paramValue != null)
                sizeMax = Long.parseLong(paramValue);
        } catch (NumberFormatException ex) {
            ServletException servletEx = new ServletException();
            servletEx.initCause(ex);
            throw servletEx;
        }
    }

    public void destroy() {
    }

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        if (!(request instanceof HttpServletRequest)) {
            chain.doFilter(request, response);
            return;
        }

        HttpServletRequest httpRequest = (HttpServletRequest) request;

        boolean isMultipartContent = FileUpload.isMultipartContent(httpRequest);
        if (!isMultipartContent) {
            chain.doFilter(request, response);
            return;
        }

        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);
                String str = item.getString();
                if (item.isFormField())
                    map.put(item.getFieldName(), new String[] { str });
                else
                    httpRequest.setAttribute(item.getFieldName(), item);
            }

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

                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) {
            ServletException servletEx = new ServletException();
            servletEx.initCause(ex);
            throw servletEx;
        }
    }
}