//! YubiHSM commands: types and traits for modeling the commands supported
//! by the HSM device, implemented in relevant modules.

mod code;
mod message;

pub use self::code::Code;

pub(crate) use self::message::Message;
use crate::{response::Response, serialization::serialize};
use serde::{de::DeserializeOwned, ser::Serialize};

/// Maximum size of a message sent to/from the YubiHSM
pub const MAX_MSG_SIZE: usize = 2048;

/// Structured command (i.e. requests) which are encrypted and then sent to
/// the HSM. Every command has a corresponding `ResponseType`.
///
/// See <https://developers.yubico.com/YubiHSM2/Commands>
pub(crate) trait Command: Serialize + DeserializeOwned + Sized {
    /// Response type for this command
    type ResponseType: Response;

    /// Command ID for this command
    const COMMAND_CODE: Code = Self::ResponseType::COMMAND_CODE;
}

impl<C: Command> From<C> for Message {
    fn from(command: C) -> Message {
        Self::create(C::COMMAND_CODE, serialize(&command).unwrap()).unwrap()
    }
}