package com.sandu.common.security;

import cn.hutool.core.util.StrUtil;
import com.sandu.common.security.config.SecurityProperties;
import com.sandu.common.security.token.TokenProvider;
import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
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;

/**
 * spring security过滤器
 * 根据token拿到用户信息，放入spring security
 *
 * @author chenjiantian
 */
@Slf4j
@AllArgsConstructor
public class TokenFilter extends OncePerRequestFilter {

    private final TokenProvider tokenProvider;
    private final SecurityProperties properties;

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
        String token = request.getHeader(properties.getHeader());

        if (token != null && token.startsWith(properties.getTokenStartWith())) {
            token = token.substring(properties.getTokenStartWith().length());
        }

        LoginUserInfo loginUserInfo = tokenProvider.validateToken(token);
        if (loginUserInfo != null) {
            if (StrUtil.equals(loginUserInfo.getToken(), token)) {
                Authentication authentication = new UsernamePasswordAuthenticationToken(
                        loginUserInfo, null,
                        loginUserInfo.getAuthorities());
                SecurityContextHolder.getContext().setAuthentication(authentication);
            }
        }


        filterChain.doFilter(request, response);
    }

}