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2024-08-09 bd3128deee35126344bc4d14a1749409859f9c4f

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package org.example.util;
 
import cn.hutool.json.JSONUtil;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import org.apache.commons.lang3.StringUtils;
import org.example.pojo.User;
import org.example.server.UserService;
import org.example.server.impl.UserServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
 
/**
 * @program: demo
 * @description:
 * @create: 2024-07-29 11:15
 **/
@Component
public class LoginInterceptor implements HandlerInterceptor {
 
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
 
        // 假设登录状态信息保存在 session 中，这里简单示例，实际项目中可能会有自己的登录状态判断逻辑
        String token = null;
        // 如果是 OPTIONS 请求，我们就让他通过，不管他
        if (request.getMethod().equals("OPTIONS")) {
            response.setStatus(HttpServletResponse.SC_OK);
            return true;
        }else {
            token = request.getHeader("token");
        }
        if(StringUtils.isEmpty(token)){
            // 未登录，返回未授权错误码或重定向到登录页
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);  // 返回 401 未授权状态码
            response.setCharacterEncoding("UTF-8");
            response.getWriter().write("请登录");
            return false;
        }
        User user = JwtUtil.verify(token);
        String s = RedisUtil.get(user.getId().toString());
        if(StringUtils.isEmpty(s) && s.equals(token)){
            // 未登录，返回未授权错误码或重定向到登录页
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);  // 返回 401 未授权状态码
            response.setCharacterEncoding("UTF-8");
            response.getWriter().write("请登录");
            return false;
        }
        return true;
    }
 
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
                           ModelAndView modelAndView) throws Exception {
    }
 
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler,
                                Exception ex) throws Exception {
    }
}