read flask cookie without secret key

read_flask_cookie.py

import zlib
import itsdangerous
import argparse


def read_flask_cookie(cookie):
    compressed_data = itsdangerous.base64_decode(cookie.split(".")[1])
    return zlib.decompress(compressed_data)


if __name__=="__main__":
    # python read_flask_cookie.py <cookie>
    parser = argparse.ArgumentParser()
    parser.add_argument("cookie")
    args = parser.parse_args()

    if args.cookie:
        print("Decoding cookie...")
        print(read_flask_cookie(args.cookie))
        print("Done!")