org.infoscoop.web.GadgetResourceServlet.java Source code

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Here is the source code for org.infoscoop.web.GadgetResourceServlet.java

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/* infoScoop OpenSource
 * Copyright (C) 2010 Beacon IT Inc.
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * as published by the Free Software Foundation.
 * 
 * This program 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 this program.  If not, see
 * <http://www.gnu.org/licenses/lgpl-3.0-standalone.html>.
 */

package org.infoscoop.web;

import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import java.util.SimpleTimeZone;

import javax.servlet.ServletException;
import javax.servlet.http.*;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.infoscoop.dao.model.Gadget;
import org.infoscoop.service.GadgetResourceService;
import org.infoscoop.service.GadgetService;
import org.infoscoop.util.DateUtility;
import org.joda.time.format.DateTimeFormat;

public class GadgetResourceServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    private static Log log = LogFactory.getLog(GadgetResourceServlet.class);

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String reqUri = req.getRequestURI();
        String resUri = reqUri.substring(reqUri.indexOf("/gadget/") + "/gadget/".length());

        String type = resUri.substring(0, resUri.indexOf("/"));
        String typeUri = resUri.substring(type.length());

        String path = typeUri.substring(0, typeUri.lastIndexOf("/") + 1);
        String name = typeUri.substring(path.length());

        if (path.length() > 1 && path.charAt(path.length() - 1) == '/')
            path = path.substring(0, path.length() - 1);

        if (name.equals(type + ".xml") && "/".equals(path)) {
            resp.sendError(403);
            return;
        }

        String ifModifiedSinceStr = req.getHeader("if-modified-since");

        GadgetResourceService service = GadgetResourceService.getHandle();
        Gadget gadget = service.getResource(type, path, name);
        if (gadget == null) {
            log.info("Gadget Resource: [" + type + "]@[" + path + "]/[" + name + "]" + " 404 Not Found");

            resp.sendError(404);
            return;
        }

        DateFormat dateFormat = DateUtility.newGMTDateFormat();
        // IE does not consider time zone
        dateFormat.setTimeZone(new SimpleTimeZone(0, "GMT"));

        if (ifModifiedSinceStr != null) {
            try {
                long ifModifiedSince = dateFormat.parse(ifModifiedSinceStr).getTime();

                // Delete millisecond 
                Calendar c = Calendar.getInstance();
                c.setTime(gadget.getLastmodified());
                c.set(Calendar.MILLISECOND, 0);
                long lastModified = c.getTimeInMillis();

                if (lastModified <= ifModifiedSince) {
                    log.info("Gadget Resource: [" + type + "]@[" + path + "]/[" + name + "]" + " 302 Not Modified");

                    resp.sendError(304);
                    return;
                }
            } catch (Exception e) {
                log.error("", e);
            }
        }

        log.info("Gadget Resource: [" + type + "]@[" + path + "]/[" + name + "]" + " 200 Success");

        resp.setContentType(getServletContext().getMimeType(name));
        if (gadget.getLastmodified() != null)
            resp.setHeader("Last-Modified", dateFormat.format(gadget.getLastmodified()));

        byte[] data = gadget.getData();
        resp.setContentLength(data.length);
        resp.getOutputStream().write(data);
        resp.getOutputStream().flush();
    }
}