"""Exact requester token validity against an admitted Railiance interval."""
def validate_token_time(claims, window):
    for field in ("iat", "exp"):
        if type(claims.get(field)) is not int:
            raise ValueError("invalid_token_time")
    if "nbf" in claims and type(claims["nbf"]) is not int:
        raise ValueError("invalid_token_time")
    if (claims["exp"] <= claims["iat"] or claims["iat"] * 1000000000 > window.lower_ns
            or claims.get("nbf", claims["iat"]) * 1000000000 > window.lower_ns
            or claims["exp"] * 1000000000 <= window.upper_ns):
        raise ValueError("token_does_not_contain_railiance_interval")