How to implement the token based authentication in GRPC interceptor with Python SDK?

class AuthInterceptor(grpc.ServerInterceptor):
    def __init__(self, identity_provider: IdentityProvider):
        self.__identity_provider = identity_provider

    def intercept_service(self, continuation, handler_call_details):
        metadata: dict[str, any] = dict(handler_call_details.invocation_metadata)

        if "authorization" not in metadata:
            return self.__abort(StatusCode.UNAUTHENTICATED, "Authorization token is missing")

        token: str = metadata["authorization"]
        if not token.startswith("Bearer "):
            return self.__abort(StatusCode.UNAUTHENTICATED, "Invalid token format")

        hashed_token: str = token[7:]
        if len(hashed_token) == 0:
            return self.__abort(StatusCode.UNAUTHENTICATED, "Invalid token")

        # >>>>> Insert code to evaluate the bearer token here <<<<<

        return continuation(handler_call_details)

    def __abort(self, code, details):
        def _end_call(ignored_request, context):
            context.abort(code, details)

        return grpc.unary_unary_rpc_method_handler(_end_call)