同一用户登录Firebase身份验证限制 [英] Firebase authentication limit login by the same user

问题描述

Firebase中是否有一种方法可以限制同一用户同时登录的次数，我想对一个帐户同时设置3个设备的限制，我该如何实现呢?

is there a way in Firebase to limit the number of logins by the same user at the same time, says I want to put a limit of 3 devices at a time for one single account, how can I achieve that ?

推荐答案

Firebase不支持.最好的办法是跟踪令牌auth_time.这是登录时间.您将为此保留3个条目的队列.每次登录用户时，发送其ID令牌以进行验证，将auth_time添加到队列(如果尚不存在)，并在队列中最旧的auth_time超过最大大小时从队列中出队(3). ).您只允许访问该队列中具有auth_times的ID令牌的数据.

That is not supported by Firebase. The best you can do is keep track of the token auth_time. This is the time of sign-in. You would keep a queue of 3 entries for that. Each time you sign-in a user, send their ID token for verification, add the auth_time to the queue (if it is not there already) and dequeue the oldest auth_time in the queue if it exceeds it maximum size (3) . You would only allow access to data for ID tokens with auth_times within that queue.

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