entropy-protocol 0.4.0

Entropy Signing and DKG protocol execution and transport logic
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// Copyright (C) 2023 Entropy Cryptography Inc.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

use std::string::FromUtf8Error;

use thiserror::Error;

/// An error relating to a websocket connection
#[derive(Debug, Error)]
pub enum WsError {
    #[error("Ws Connection closed unexpectedly")]
    ConnectionClosed,
    #[error("Connection error: {0}")]
    ConnectionError(String),
    #[error("Message received after signing protocol has finished")]
    MessageAfterProtocolFinish,
    #[error("UTF8 parse error {0}")]
    UTF8Parse(#[from] FromUtf8Error),
    #[error("Cannot get signer from app state")]
    SignerFromAppState,
    #[error("Unexpected message type")]
    UnexpectedMessageType,
    #[error("Encrypted connection error {0}")]
    EncryptedConnection(String),
    #[error("Error parsing Signing Message")]
    ProtocolMessage(#[from] super::errors::ProtocolMessageErr),
    #[error("Serialization Error: {0:?}")]
    Serialization(#[from] bincode::Error),
    #[error("Received bad subscribe message")]
    BadSubscribeMessage,
    #[error("Node has started fresh and is not yet successfully set up")]
    NotReady,
}

/// An error relating to handling a `ProtocolMessage`
#[derive(Debug, Error)]
pub enum ProtocolMessageErr {
    #[error("Utf8Error: {0:?}")]
    Utf8(#[from] std::str::Utf8Error),
    #[error("Deserialization Error: {0:?}")]
    Deserialization(#[from] bincode::Error),
}

/// Errors relating to encrypted WS connections / noise handshaking
#[derive(Debug, Error)]
pub enum EncryptedConnectionErr {
    #[error("Noise error: {0}")]
    Noise(#[from] snow::error::Error),
    #[error("Utf8Error: {0:?}")]
    Utf8(#[from] std::str::Utf8Error),
    #[error("Utf8Error: {0:?}")]
    FromUtf8(#[from] FromUtf8Error),
    #[error("Websocket error: {0}")]
    WebSocket(#[from] WsError),
    #[error("Could not get remote public key")]
    RemotePublicKey,
}

/// Error when checking supported protocol versions
#[derive(Debug, Error, PartialEq)]
pub enum ProtocolVersionMismatchError {
    #[error("This version of the protocol is newer than ours - we are on version {0}")]
    VersionTooNew(u32),
    #[error("This version of the protocol is no longer supported - the oldest we support is {0}")]
    VersionTooOld(u32),
}