net.swas.explorer.servlet.ms.MSStateUpdate.java Source code

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Here is the source code for net.swas.explorer.servlet.ms.MSStateUpdate.java

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/*
 * This file is part of WebSiren.
 *
 *  WebSiren is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
    
 *  WebSiren 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with WebSiren.  If not, see <http://www.gnu.org/licenses/>.
 */
package net.swas.explorer.servlet.ms;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.swas.explorer.ms.service.MSServiceConsumer;
import net.swas.explorer.ms.service.MSServiceProducer;
import net.swas.explorer.ms.service.ModSecService;
import net.swas.explorer.util.FormFieldValidator;

import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * The MSStateUpdate is a Servlet implementation class  for processing update modsecurity state
 * request to remote websiren agent. It will be blocking call to the remote service which will 
 * wait for a response for 5 seconds. If it didnt get the response it acknowledge an error to the browser. 
 */
@WebServlet("/msStateUpdate")
public class MSStateUpdate extends HttpServlet {

    private final static Logger log = LoggerFactory.getLogger(MSStateUpdate.class);
    private MSServiceProducer prod = null;
    private MSServiceConsumer cons = null;
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public MSStateUpdate() {
        super();
    }

    /** (non-Javadoc)
     * @see javax.servlet.GenericServlet#init(javax.servlet.ServletConfig)
     */
    @Override
    public void init(ServletConfig config) throws ServletException {

        super.init(config);
        this.prod = ModSecService.getMSServiceProducer(getServletContext());
        this.cons = ModSecService.getMSServiceConsumer(getServletContext());

    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        // TODO Auto-generated method stub
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    @SuppressWarnings("unchecked")
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        String action = request.getParameter("action");
        String status = "", msg = "";

        PrintWriter out = response.getWriter();
        JSONObject respJson = new JSONObject();
        JSONObject messageJson = new JSONObject();

        response.setContentType("application/json");
        response.setCharacterEncoding("UTF-8");

        messageJson.put("action", action);
        this.prod.send(messageJson.toJSONString());

        if (FormFieldValidator.isLogin(request.getSession())) {

            String revMsg = this.cons.getReceivedMessage(request.getServletContext());
            log.info("Received Message :" + revMsg);
            if (revMsg != null) {

                JSONParser parser = new JSONParser();
                JSONObject revJson = null;
                try {

                    revJson = (JSONObject) parser.parse(revMsg);
                    respJson = revJson;

                } catch (ParseException e) {

                    status = "1";
                    msg = "Unable to reach modsercurity service. Please try later";
                    e.printStackTrace();

                }

            } else {

                status = "1";
                msg = "Unable to reach modsercurity service. Please try later";
                log.info("Message is not received......");

            }

            if (!status.equals("")) {

                respJson.put("status", status);
                respJson.put("message", msg);

            }
        } else {
            status = "2";
            msg = "User Session Expired";
            respJson.put("status", status);
            respJson.put("message", msg);
        }

        try {
            log.info("Sending Json : " + respJson.toString());
            out.print(respJson.toString());
        } finally {
            out.close();
        }

    }

}