package com.sandu.common.security;

import com.sandu.common.redis.online.OnlineUser;
import com.sandu.common.redis.online.OnlineUserService;
import com.sandu.common.security.config.SecurityProperties;
import com.sandu.common.security.jwt.JwtTokenProvider;
import com.sandu.common.util.SpringContextHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.util.StringUtils;
import org.springframework.web.filter.GenericFilterBean;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
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
public class TokenFilter extends GenericFilterBean {

    private final JwtTokenProvider tokenProvider;

    public TokenFilter(JwtTokenProvider tokenProvider) {
        this.tokenProvider = tokenProvider;
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
            throws IOException, ServletException {
        HttpServletRequest httpServletRequest = (HttpServletRequest) servletRequest;
        String token = tokenProvider.getToken(httpServletRequest);
        SecurityProperties properties = SpringContextHolder.getBean(SecurityProperties.class);


        if (StringUtils.hasText(token) && tokenProvider.validateToken(token)) {
            Authentication authentication = tokenProvider.getAuthentication(token);
            // 是否使用redis缓存用户功能
            if (!properties.isCacheOnline()) {
                SecurityContextHolder.getContext().setAuthentication(authentication);
            } else {
                OnlineUserService onlineUserService = SpringContextHolder.getBean(OnlineUserService.class);
                OnlineUser onlineUser = onlineUserService.getOne(properties.getOnlineKey() + ((UserDetails) authentication.getPrincipal()).getUsername());
                if (onlineUser != null) {
                    // 匹配上当前用户的token才合法，防止jwt不受控制
                    if (token.equals(onlineUser.getToken())) {
                        SecurityContextHolder.getContext().setAuthentication(authentication);
                    }
                }
            }
        }

        filterChain.doFilter(servletRequest, servletResponse);
    }

}