参考-刷新过期的JWT示例

另一种替代方法是，一旦JWT过期，用户/系统将调用 另一个url suppose /refreshtoken。与此请求一起通过的还有过期的JWT。服务器会返回一个新的JWT供用户/系统使用。

如果您正在使用AWS Amplify & Cognito，这将为您带来魔力:

Use Auth.currentSession() to get the current valid token or get new if the current has expired. Amplify will handle it As a fallback, use some interval job to refresh tokens on demand every x minutes, maybe 10 min. This is required when you have a long-running process like uploading a very large video which will take more than an hour (maybe due to a slow network) then your token will expire during the upload and amplify will not update automatically for you. In this case, this strategy will work. Keep updating your tokens at some interval. How to refresh on demand is not mentioned in docs so here it is.

import { Auth } from 'aws-amplify';

try {
  const cognitoUser = await Auth.currentAuthenticatedUser();
  const currentSession = await Auth.currentSession();
  cognitoUser.refreshSession(currentSession.refreshToken, (err, session) => {
    console.log('session', err, session);
    const { idToken, refreshToken, accessToken } = session;
    // do whatever you want to do now :)
  });
} catch (e) {
  console.log('Unable to refresh Token', e);
}

来源:https://github.com/aws-amplify/amplify-js/issues/2560

问得好——问题本身包含了丰富的信息。

文章“刷新令牌:何时使用它们以及它们如何与jwt交互”为这种场景提供了一个很好的想法。一些要点是:-

刷新令牌携带获取新访问所需的信息 令牌。 刷新令牌也会过期，但寿命相当长。 刷新令牌通常需要严格的存储要求 确保它们不会泄露。 它们还可以被授权服务器列入黑名单。

也可以看看auth0/angular-jwt angularjs

用于Web API。在AngularJS应用程序中启用OAuth刷新令牌使用ASP .NET Web API 2和Owin

这个方法怎么样:

对于每个客户端请求，服务器将令牌的过期时间与(currentTime - lastAccessTime)进行比较。 如果expirationTime < (currentTime - lastAccessedTime)，则将上一次lastAccessedTime更改为currentTime。 如果浏览器上的不活动时间超过了过期时间，或者如果浏览器窗口被关闭并且过期时间为> (currentTime - lastAccessedTime)，那么服务器可以使令牌过期并要求用户再次登录。

在这种情况下，刷新令牌不需要额外的端点。 将感激任何反馈。

在你自己处理认证的情况下(即不使用Auth0这样的提供者)，以下方法可能有效:

Issue JWT token with relatively short expiry, say 15min. Application checks token expiry date before any transaction requiring a token (token contains expiry date). If token has expired, then it first asks API to 'refresh' the token (this is done transparently to the UX). API gets token refresh request, but first checks user database to see if a 'reauth' flag has been set against that user profile (token can contain user id). If the flag is present, then the token refresh is denied, otherwise a new token is issued. Repeat.

例如，当用户重置密码时，数据库后端的'reauth'标志将被设置。当用户下次登录时，该标志将被删除。

此外，假设您有一个策略，用户必须至少每72小时登录一次。在这种情况下，API令牌刷新逻辑还将从用户数据库检查用户的最后登录日期，并在此基础上拒绝/允许令牌刷新。

jwt-autorefresh

如果你正在使用node (React / Redux / Universal JS)，你可以安装npm i -S jwt-autorefresh。

这个库计划在访问令牌到期之前的用户计算的秒数刷新JWT令牌(基于令牌中编码的exp声明)。它有一个广泛的测试套件，并检查相当多的条件，以确保任何奇怪的活动都伴随着关于来自您的环境的错误配置的描述性消息。

完整的示例实现

import autorefresh from 'jwt-autorefresh'

/** Events in your app that are triggered when your user becomes authorized or deauthorized. */
import { onAuthorize, onDeauthorize } from './events'

/** Your refresh token mechanism, returning a promise that resolves to the new access tokenFunction (library does not care about your method of persisting tokens) */
const refresh = () => {
  const init =  { method: 'POST'
                , headers: { 'Content-Type': `application/x-www-form-urlencoded` }
                , body: `refresh_token=${localStorage.refresh_token}&grant_type=refresh_token`
                }
  return fetch('/oauth/token', init)
    .then(res => res.json())
    .then(({ token_type, access_token, expires_in, refresh_token }) => {
      localStorage.access_token = access_token
      localStorage.refresh_token = refresh_token
      return access_token
    })
}

/** You supply a leadSeconds number or function that generates a number of seconds that the refresh should occur prior to the access token expiring */
const leadSeconds = () => {
  /** Generate random additional seconds (up to 30 in this case) to append to the lead time to ensure multiple clients dont schedule simultaneous refresh */
  const jitter = Math.floor(Math.random() * 30)

  /** Schedule autorefresh to occur 60 to 90 seconds prior to token expiration */
  return 60 + jitter
}

let start = autorefresh({ refresh, leadSeconds })
let cancel = () => {}
onAuthorize(access_token => {
  cancel()
  cancel = start(access_token)
})

onDeauthorize(() => cancel())

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