SessionTimeOutFilter.java

package com.rau.evoting.filters;

import java.io.IOException;
import java.util.ArrayList;

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.HttpServletResponse;

import com.rau.evoting.beans.TrusteeHomeBean;
import com.sun.xml.internal.ws.util.StringUtils;

public class SessionTimeOutFilter implements Filter {

	private String timeOutPage = "Login.xhtml";
	private ArrayList<String> trusteeHomeUrls;
	
	@Override
	public void init(FilterConfig arg0) throws ServletException {
		trusteeHomeUrls = new ArrayList<String>();
		trusteeHomeUrls.add("/Evoting/TrusteeElection.xhtml");
	}

	@Override
	public void destroy() {	
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest)request;
		HttpServletResponse res = (HttpServletResponse)response;

		if(trusteeHomeUrls.contains(req.getRequestURI())) {
			timeOutPage = "TrusteeHome.xhtml";
		}
		else {
			timeOutPage = "Login.xhtml";
		}
		
		if(!req.getRequestURI().equals("/Evoting/Login.xhtml") && !req.getRequestURI().equals("/Evoting/") 
				&& !req.getRequestURI().equals("/Evoting/TrusteeHome.xhtml") && !req.getRequestURI().equals("/Evoting/DecodeVotes.xhtml") && !req.getRequestURI().equals("/Evoting/MixNode.xhtml")) {
		
			if(isSessionInvalid(req)) {
				System.out.println("Session is invalid");
				String timeOutUrl = req.getContextPath() + "/" + timeOutPage;
				res.sendRedirect(timeOutUrl);
				return ;
			}
		}

		chain.doFilter(request, response);
	}

	public String getTimeOutPage() {
		return timeOutPage;
	}

	public void setTimeOutPage(String timeOutPage) {
		this.timeOutPage = timeOutPage;
	}
	
	private boolean isSessionInvalid(HttpServletRequest httpServletRequest) {
		boolean sessionInValid = (httpServletRequest.getRequestedSessionId() != null) && !httpServletRequest.isRequestedSessionIdValid();
		//System.out.println(httpServletRequest.isRequestedSessionIdValid());
		return sessionInValid;
	}
	
}