Get FreeOTP backup json file and create the QRCode to import into other apps

freeotp_migrator.py

#
# Get FreeOTP backup json file and create the QRCode to import into other apps
#
# python <this-script> </path/to/freeotp/backup/file.json>
#

import ctypes
import base64
import sys
import json
import io
import qrcode
from urllib.parse import quote_plus as uenc

def generate_secret(raw_bytes):
    secret_bytes = [ctypes.c_ubyte(x).value for x in raw_bytes]
    secret_hex = ''.join('%02X' % (x,) for x in secret_bytes)
    secret = bytes.fromhex(secret_hex)

    return base64.b32encode(secret).decode('ascii')

def print_qr(data):
    output = io.StringIO()

    qr = qrcode.QRCode()
    qr.add_data(raw_url)
    qr.print_ascii(out=output, invert=True)

    print(output.getvalue())

if __name__ == "__main__":
    with open(sys.argv[1], "r") as backup_file:
        entries = json.load(backup_file)

        for token in entries["tokens"]:

            print();
            print();
            print("=" * 70);
            print();

            issuer = token["issuerExt"] if token["issuerExt"] else "No Issuer"
            label = token["label"]

            print(f"{issuer} => {label}")

            raw_url = f"otpauth://{token['type'].lower()}/{uenc(issuer)}:{uenc(label)}?secret={generate_secret(token['secret'])}&digits={token['digits']}&counter={token['counter']}&period={token['period']}".replace("+", "%20")

            print(raw_url)


            print_qr(raw_url)