com.cubusmail.gwtui.server.services.RetrieveAttachmentServlet.java Source code

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Here is the source code for com.cubusmail.gwtui.server.services.RetrieveAttachmentServlet.java

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/* RetrieveAttachmentServlet.java
    
   Copyright (c) 2009 Juergen Schlierf, All Rights Reserved
       
   This file is part of Cubusmail (http://code.google.com/p/cubusmail/).
       
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 3 of the License, or (at your option) any later version.
       
   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.
       
   You should have received a copy of the GNU Lesser General Public
   License along with Cubusmail. If not, see <http://www.gnu.org/licenses/>.
       
 */
package com.cubusmail.gwtui.server.services;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.List;

import javax.mail.Message;
import javax.mail.internet.ContentType;
import javax.mail.internet.MimePart;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import com.cubusmail.mail.IMailbox;
import com.cubusmail.mail.SessionManager;
import com.cubusmail.mail.util.MessageUtils;

/**
 * Servlet for attachment download.
 *
 * @author Juergen Schlierf
 */
public class RetrieveAttachmentServlet extends HttpServlet {

    private Logger logger = Logger.getLogger(this.getClass());

    /**
     * 
     */
    private static final long serialVersionUID = -648851359889982062L;

    /*
     * (non-Javadoc)
     * 
     * @see javax.servlet.http.HttpServlet#service(javax.servlet.ServletRequest,
     * javax.servlet.ServletResponse)
     */
    @Override
    public void service(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        WebApplicationContext context = WebApplicationContextUtils
                .getRequiredWebApplicationContext(request.getSession().getServletContext());

        try {
            String messageId = request.getParameter("messageId");
            String attachmentIndex = request.getParameter("attachmentIndex");
            boolean view = "1".equals(request.getParameter("view"));

            if (messageId != null) {
                IMailbox mailbox = SessionManager.get().getMailbox();
                Message msg = mailbox.getCurrentFolder().getMessageById(Long.parseLong(messageId));

                List<MimePart> attachmentList = MessageUtils.attachmentsFromPart(msg);
                int index = Integer.valueOf(attachmentIndex);

                MimePart retrievePart = attachmentList.get(index);

                ContentType contentType = new ContentType(retrievePart.getContentType());

                String fileName = retrievePart.getFileName();
                if (StringUtils.isEmpty(fileName)) {
                    fileName = context.getMessage("message.unknown.attachment", null,
                            SessionManager.get().getLocale());
                }
                StringBuffer contentDisposition = new StringBuffer();
                if (!view) {
                    contentDisposition.append("attachment; filename=\"");
                    contentDisposition.append(fileName).append("\"");
                }

                response.setHeader("cache-control", "no-store");
                response.setHeader("pragma", "no-cache");
                response.setIntHeader("max-age", 0);
                response.setIntHeader("expires", 0);

                if (!StringUtils.isEmpty(contentDisposition.toString())) {
                    response.setHeader("Content-disposition", contentDisposition.toString());
                }
                response.setContentType(contentType.getBaseType());
                // response.setContentLength(
                // MessageUtils.calculateSizeFromPart( retrievePart ) );

                BufferedInputStream bufInputStream = new BufferedInputStream(retrievePart.getInputStream());
                OutputStream outputStream = response.getOutputStream();

                byte[] inBuf = new byte[1024];
                int len = 0;
                int total = 0;
                while ((len = bufInputStream.read(inBuf)) > 0) {
                    outputStream.write(inBuf, 0, len);
                    total += len;
                }

                bufInputStream.close();
                outputStream.flush();
                outputStream.close();

            }
        } catch (Exception ex) {
            logger.error(ex.getMessage(), ex);
        }
    }
}