Function device_authorization_route 

pub(crate) async fn device_authorization_route(
    __arg0: State<State>,
    __arg1: ClientIp,
    __arg2: Form<DeviceAuthRequest>,
) -> impl IntoResponse

RFC 8628 §3.1: the device authorization endpoint. Mints a device_code / user_code pair and returns the verification URIs for the user.