Fastfile Link Generator _top_ Official

[1] Berners-Lee, T., Fielding, R., & Masinter, L. (2005). Uniform Resource Identifier (URI): Generic Syntax . RFC 3986. [2] Krawczyk, H., Bellare, M., & Canetti, R. (1997). HMAC: Keyed-Hashing for Message Authentication . RFC 2104. [3] Amazon Web Services. (2024). Presigned URLs for Amazon S3 . AWS Documentation. [4] Bloom, B. H. (1970). Space/time trade-offs in hash coding with allowable errors. Communications of the ACM , 13(7), 422-426.

Comparison with database-backed generator: fastfile link generator

def verify_token(token: str): data = base64.urlsafe_b64decode(token) payload = data[:-32] recv_mac = data[-32:] computed = hmac.new(SECRET, payload, sha256).digest() if not hmac.compare_digest(recv_mac, computed): return None version, exp = struct.unpack("!BI", payload[:5]) if exp < time.time(): return None return payload[5:].decode() Test environment: AWS t3.medium (2 vCPU, 4 GB RAM), Python 3.11 + uvicorn. [1] Berners-Lee, T