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import time
def verify_safetynet_timestamp(timestamp_ms: int) -> None:
"""Handle time drift between an RP and the Google SafetyNet API servers with a window of
time within which the response is valid
"""
# Buffer period in ms
grace_ms = 10 * 1000
# Get "now" in ms
now = int(time.time()) * 1000
# Make sure the response was generated in the past
if timestamp_ms > (now + grace_ms):
raise ValueError(f"Payload timestamp {timestamp_ms} was later than {now} + {grace_ms}")
# Make sure the response arrived within the grace period
if timestamp_ms < (now - grace_ms):
raise ValueError("Payload has expired")
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