package com.rjlresaka.filter;

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.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@WebFilter(urlPatterns = { "/app/*", "/logout" })
public class AuthFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        // No init params required.
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        HttpServletRequest httpRequest = (HttpServletRequest) request;
        HttpServletResponse httpResponse = (HttpServletResponse) response;
        HttpSession session = httpRequest.getSession(false);
        boolean authenticated = session != null && session.getAttribute("authUser") != null;

        if (!authenticated) {
            httpResponse.sendRedirect(httpRequest.getContextPath() + "/login");
            return;
        }
        chain.doFilter(request, response);
    }

    @Override
    public void destroy() {
        // Nothing to destroy.
    }
}
