def _get_conn_params(self):
        """
        one method to fetch connection params as a dict
        used in get_uri() and get_connection()
        """
        conn = self.get_connection(self.snowflake_conn_id)
        account = conn.extra_dejson.get('account', None)
        warehouse = conn.extra_dejson.get('warehouse', None)
        database = conn.extra_dejson.get('database', None)
        region = conn.extra_dejson.get("region", None)
        role = conn.extra_dejson.get('role', None)

        conn_config = {
            "user": conn.login,
            "password": conn.password or '',
            "schema": conn.schema or '',
            "database": self.database or database or '',
            "account": self.account or account or '',
            "warehouse": self.warehouse or warehouse or '',
            "region": self.region or region or '',
            "role": self.role or role or '',
        }

        """
        If private_key_file is specified in the extra json, load the contents of the file as a private
        key and specify that in the connection configuration. The connection password then becomes the
        passphrase for the private key. If your private key file is not encrypted (not recommended), then
        leave the password empty.
        """
        private_key_file = conn.extra_dejson.get('private_key_file', None)
        if private_key_file:
            with open(private_key_file, "rb") as key:
                passphrase = None
                if conn.password:
                    passphrase = conn.password.strip().encode()

                p_key = serialization.load_pem_private_key(
                    key.read(),
                    password=passphrase,
                    backend=default_backend()
                )

            pkb = p_key.private_bytes(encoding=serialization.Encoding.DER,
                                      format=serialization.PrivateFormat.PKCS8,
                                      encryption_algorithm=serialization.NoEncryption())

            conn_config['private_key'] = pkb
            conn_config.pop('password', None)

        return conn_config
one method to fetch connection params as a dict
        used in get_uri() and get_connection()