import axios from 'axios'
import store from '../store'
import router from '../router'
//設(shè)置全局axios默認(rèn)值
axios.defaults.timeout = 6000; //6000的超時(shí)驗(yàn)證
axios.defaults.headers.post['Content-Type'] = 'application/json;charset=UTF-8';
//創(chuàng)建一個(gè)axios實(shí)例
const instance = axios.create();
instance.defaults.headers.post['Content-Type'] = 'application/json;charset=UTF-8';
axios.interceptors.request.use = instance.interceptors.request.use;
//request攔截器
instance.interceptors.request.use(
  config => {
    //每次發(fā)送請(qǐng)求之前檢測(cè)都vuex存有token,那么都要放在請(qǐng)求頭發(fā)送給服務(wù)器
    if(store.state.token){
      config.headers.Authorization = `token ${store.state.token}`;
    }
    return config;
  },
  err => {
    return Promise.reject(err);
  }
);
//respone攔截器
instance.interceptors.response.use(
  response => {
    return response;
  },
  error => { //默認(rèn)除了2XX之外的都是錯(cuò)誤的，就會(huì)走這里
    if(error.response){
      switch(error.response.status){
        case 401:
          store.dispatch('UserLogout'); //可能是token過(guò)期，清除它
          router.replace({ //跳轉(zhuǎn)到登錄頁(yè)面
            path: 'login',
            query: { redirect: router.currentRoute.fullPath } // 將跳轉(zhuǎn)的路由path作為參數(shù)，登錄成功后跳轉(zhuǎn)到該路由
          });
      }
    }
    return Promise.reject(error.response);
  }
);
export default instance;

 //注冊(cè)全局鉤子用來(lái)攔截導(dǎo)航
router.beforeEach((to, from, next) => {
 //獲取store里面的token
 let token = store.state.token;
 //判斷要去的路由有沒(méi)有requiresAuth
 if(to.meta.requiresAuth){
  if(token){
   next();
  }else{
   next({
    path: '/login',
    query: { redirect: to.fullPath } // 將剛剛要去的路由path（卻無(wú)權(quán)限）作為參數(shù)，方便登錄成功后直接跳轉(zhuǎn)到該路由
   });
  }
 }else{
  next();//如果無(wú)需token,那么隨它去吧
 }
});

 router.get('/dosh',checkToken,User.dosh)
const jwt = require('jsonwebtoken');

const jwt = require('jsonwebtoken');
//登錄時(shí)：核對(duì)用戶(hù)名和密碼成功后，應(yīng)用將用戶(hù)的id（圖中的user_id）作為JWT Payload的一個(gè)屬性
module.exports = function(user_id){
  const token = jwt.sign({
    user_id: user_id
  }, 'sinner77', {
    expiresIn: '3600s' //過(guò)期時(shí)間設(shè)置為60妙。那么decode這個(gè)token的時(shí)候得到的過(guò)期時(shí)間為 : 創(chuàng)建token的時(shí)間 +　設(shè)置的值
  });
  return token;
};

//檢查token是否過(guò)期
module.exports = async ( ctx, next ) => {
  if(ctx.request.header['authorization']){
    let token = ctx.request.header['authorization'].split(' ')[1];
    //解碼token
    let decoded = jwt.decode(token, 'sinner77');
    //console.log(decoded);的輸出 ：{ user_id: '123123123', iat: 1494405235, exp: 1494405235 }
    if(token && decoded.exp <= new Date()/1000){
      ctx.status = 401;
      ctx.body = {
        message: 'token過(guò)期'
      };
    }else{
      //如果權(quán)限沒(méi)問(wèn)題，那么交個(gè)下一個(gè)控制器處理
      return next();
    }
  }else{
    ctx.status = 401;
    ctx.body = {
      message: '沒(méi)有token'
    }
  }
};