import java.io.IOException;
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.annotation.WebFilter;
import javax.servlet.http.*;

/**
 * Servlet Filter implementation class LoginFilter
 */
@WebFilter("/LoginFilter")
public class LoginFilter implements Filter {

    /**
     * Default constructor.
     */
    public LoginFilter() {
        // TODO Auto-generated constructor stub
    }

    /**
     * @see Filter#destroy()
     */
    public void destroy() {
        // TODO Auto-generated method stub
    }

    /**
     * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
     */
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) request;
        HttpServletResponse res = (HttpServletResponse) response;
        HttpSession session = req.getSession(false);
        Boolean isNotLogged = (session== null || session.getAttribute("user") == null);
        Boolean indexRequest = req.getRequestURI().equals(req.getContextPath() + "/index.jsp");
        Boolean loginRequest = req.getRequestURI().equals(req.getContextPath() + "/login");

        /*if(session != null)
            System.out.println(session + " " + session.getAttribute("name"));*/

        if(isNotLogged && !indexRequest && !loginRequest)
        {
            res.sendRedirect(req.getContextPath() + "/index.jsp");
        }
        else
            chain.doFilter(request, response);
    }

    /**
     * @see Filter#init(FilterConfig)
     */
    public void init(FilterConfig fConfig) throws ServletException {
        // TODO Auto-generated method stub
    }

}