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Generate a Mock Presigned URL in Python with HMAC

Build a mock AWS S3 presigned URL using an HMAC-SHA256 signature, mimicking the core SigV4 pattern without cloud SDK dependencies.

aws s3 presigned-url
Python 
import hashlib
import hmac
import time
import base64

def generate_presigned_url_mock(secret_key, bucket, object_key, expires_in=3600):
    # Build the canonical request string (simplified AWS SigV4 style)
    timestamp = str(int(time.time()))
    expiry = str(int(time.time()) + expires_in)
    payload = f"GET\n/{buck…
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