# Build policy JSON (supports wildcard paths automatically if URL ends with *) if url.endswith("*"): resource = url else: resource = url

policy = { "Statement": [{ "Resource": resource, "Condition": { "DateLessThan": {"AWS:EpochTime": epoch_expire} } }] }

def generate_signed_url( self, url: str, expire_time: datetime.datetime, ip_range: str = None ) -> str: """ Generate a signed CloudFront URL. - url: The full CloudFront object URL (e.g., https://d123.cloudfront.net/video.mp4) - expire_time: UTC datetime when the URL expires. - ip_range: Optional CIDR (e.g., "203.0.113.0/24") to restrict client IP. """ epoch_expire = int(expire_time.timestamp())

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