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("/jsp/secret/*")
public class AuthFilter implements Filter {
	private String redirectPage = "../LoginFailed.jsp";

	@Override
	public void destroy() {}

	@Override
	public void doFilter(ServletRequest request0, ServletResponse response0, FilterChain chain) throws IOException, ServletException {
		HttpServletRequest request  = (HttpServletRequest)request0;
		HttpServletResponse response = (HttpServletResponse)response0;
		HttpSession session = request.getSession(false);
		if(session==null || (String)session.getAttribute("account")==null) {
			response.sendRedirect(response.encodeRedirectURL(redirectPage));
		} else {
			request.setCharacterEncoding("UTF-8"); 
			chain.doFilter(request, response);
			return;
		}
	}

	@Override
	public void init(FilterConfig fConfig) throws ServletException {}
}