Generates a secure random string

def make_random_key() -> Text:
    """
    Generates a secure random string
    """

    r = SystemRandom()
    allowed = \
        'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_+/[]'

    return ''.join([r.choice(allowed) for _ in range(0, 50)])