secret_key.py

def generate_or_read_from_file(key_file='.secret_key', key_length=64):
    """Multiprocess-safe secret key file generator.

    Useful to replace the default (and thus unsafe) SECRET_KEY in settings.py
    upon first start. Save to use, i.e. when multiple Python interpreters
    serve the dashboard Django application (e.g. in a mod_wsgi + daemonized
    environment).  Also checks if file permissions are set correctly and
    throws an exception if not.
    """
    lock = lockfile.FileLock(key_file)
    with lock:
        if not os.path.exists(key_file):
            key = generate_key(key_length)
            with open(key_file, 'w') as f:
                f.write(key)
            os.chmod(key_file, 0600)
        else:
            if oct(os.stat(key_file).st_mode & 0o777) != '0600':
                raise FilePermissionError("Insecure key file permissions!")
            with open(key_file, 'r') as f:
                key = f.readline()
        return key