springcloud的gateway中怎么根据header中token里的某个属性来限流？

我想在springcloud的gateway中获取header头里的token，token解密后有userId和deviceId，并且对deviceId=1的请求限流，请问该怎么做？请提供点建议或参考代码，谢谢。

Start with the Spring Cloud Gateway integration and Sentinel's rate-limiting entry points. Determine how the header token is decoded to obtain deviceId, then define how requests with deviceId=1 should be limited. Done means a documented approach or reference implementation clearly enforces that limit.

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