Question

当jwt过期时（我的默认值为30分钟），我需要被警告，有人可以帮助我吗？我希望警告用户并将其重定向到登录页面

    const isInRole = (role: string): boolean => {
      try {
        const jwt = localStorage.getItem("token");
        if (jwt) {
          var user = jwtDecode<User>(jwt);
          if (typeof user.roles === "string") return user.roles.toLowerCase() === role.toLowerCase();
          return user.roles.some(r => r == role);
        }
        return false;
      } catch (ex) {

      }
      return false;
    };

//here´s where I check the jwt value
    const isAuthenticated = () => {
      try {
        const jwt = localStorage.getItem("token");
        if (jwt) {
          jwtDecode<User>(jwt);

          return true;
        }
      } catch (ex) {}
      return false;

    };
    const getJWT = () => localStorage.getItem("token");

    http.setJWT(getJWT());

你能告诉我我想念什么吗？

Answer 1

在从本地存储中加载令牌时，但在将令牌设置为应用程序状态之前，请检查令牌是否已过期：

let token = localStorage.getItem("token")
let payload = jwtDecode(token)

// payload.exp should contain the expiration epoch set upon creation
if (payload.exp > Math.round(Date.now() / 1000)) {
  alert("Your token has expired!")
}

如果您没有到期字段，但是有一个“ issued-at”（iat）字段，则以下逻辑也将足以检查自发出之日起已经过30分钟：

const TIME_DELTA = 30 * 60 * 1000; // convert 30 minutes to epoch time 
if (payload.iat + TIME_DELTA <= Math.round(Date.now() / 1000)) {
  alert("Your token was issued more than 30 minutes ago!")
}

jwt到期时如何警告？

1 个答案: