import cryptography.fernet
import json


def generate_auth_config(json_file_name, host, port, username, pwd):
    key = cryptography.fernet.Fernet.generate_key()
    f = cryptography.fernet.Fernet(key)
    token = f.encrypt(pwd.encode('ascii'))  # unicode intp byte string
    config = dict(hostname=host, port=port, username=username, key=key.decode('ascii'),
                  password_token=token.decode('ascii'))

    json.dump(config, open(json_file_name, 'w'))


generate_auth_config('ftpauth.json', 'localhost', 21, 'training', 'training')



"""
print('encrypt :', token)

password = f.decrypt(token)
print(password)
print(type(password))
print(password.decode('ascii'))  # byte into unicode
"""