package com.juick.server.security;

import com.juick.User;
import com.juick.server.security.entities.JuickUser;
import com.juick.service.UserService;
import org.springframework.security.authentication.AnonymousAuthenticationToken;
import org.springframework.security.authentication.RememberMeAuthenticationToken;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * Created by aalexeev on 4/5/17.
 */
public class HashParamAuthenticationFilter extends OncePerRequestFilter {
    public static final String PARAM_NAME = "hash";

    private final UserService userService;


    public HashParamAuthenticationFilter(UserService userService) {
        this.userService = userService;
    }

    @Override
    protected void doFilterInternal(
            HttpServletRequest request,
            HttpServletResponse response,
            FilterChain filterChain) throws ServletException, IOException {

        String hash = request.getHeader(PARAM_NAME);

        if (hash == null)
            hash = request.getParameter(PARAM_NAME);

        if (hash != null && authenticationIsRequired()) {
            User user = userService.getUserByHash(hash);

            if (!user.isAnonymous())
                SecurityContextHolder.getContext().setAuthentication(
                        new RememberMeAuthenticationToken(hash, new JuickUser(user), JuickUser.USER_AUTHORITY));
        }

        filterChain.doFilter(request, response);
    }

    private boolean authenticationIsRequired() {
        Authentication existingAuth = SecurityContextHolder.getContext().getAuthentication();

        if (existingAuth == null || !existingAuth.isAuthenticated())
            return true;

        if (existingAuth instanceof AnonymousAuthenticationToken)
            return true;

        return false;
    }
}