package com.sincere.student.access;

import com.alibaba.fastjson.JSON;
import com.sincere.student.dto.BaseDto;
import com.sincere.student.utils.ResultException;
import com.sincere.student.utils.TokenUtils;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;


public class MemberInterceptor extends HandlerInterceptorAdapter {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        if (handler instanceof HandlerMethod) {

            HandlerMethod myHandlerMethod = (HandlerMethod) handler;
            Method method = myHandlerMethod.getMethod();
            Annotation methodAnnotation = method.getAnnotation(MemberAccess.class);//方法上有该标记
            if (methodAnnotation != null) {
                boolean isLogin = isLogin(request);
                if (isLogin) {
                    return true;
                } else {//未登录
                    //Ajax请求返回JSON
                    BaseDto repVo = new BaseDto();
                    repVo.setSuccess(false);
                    repVo.setMessage("请先登录");
                    String data = JSON.toJSONString(repVo);
                    response.setHeader("content-type", "text/html;charset=UTF-8");
                    OutputStream out = response.getOutputStream();
                    out.write(data.getBytes("UTF-8"));
                    return false;
                }
            }
        }
        return true;
    }

    private boolean isLogin(HttpServletRequest request) throws Exception {
        try {
            String token = request.getHeader("X-Authorization");
            if (token != null) {
                try {
                    TokenUtils.validToken(token);
                    return true;
                } catch (ResultException e) {

                }
            }
        } catch (Exception e) {
            return false;
        }
        return false;
    }
}