cosm-orc 2.6.2

Cosmwasm smart contract orchestration and gas profiling library
Documentation 
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use crate::client::error::ClientError;
use cosmrs::crypto::secp256k1;
use cosmrs::{bip32, AccountId};
use keyring::Entry;

// https://github.com/confio/cosmos-hd-key-derivation-spec#the-cosmos-hub-path
const DERVIATION_PATH: &str = "m/44'/118'/0'/0/0";

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct SigningKey {
    /// human readable key name
    pub name: String,
    /// private key associated with `name`
    pub key: Key,
}

impl SigningKey {
    pub fn to_account(&self, prefix: &str) -> Result<AccountId, ClientError> {
        let key: secp256k1::SigningKey = self.try_into()?;
        let account = key
            .public_key()
            .account_id(prefix)
            .map_err(ClientError::crypto)?;
        Ok(account)
    }
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub enum Key {
    /// Mnemonic allows you to pass the private key mnemonic words
    /// to Cosm-orc for configuring a transaction signing key.
    /// DO NOT USE FOR MAINNET
    Mnemonic(String),

    // TODO: Add Keyring password CRUD operations
    /// Use OS Keyring to access private key.
    /// Safe for testnet / mainnet.
    Keyring(KeyringParams),
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct KeyringParams {
    pub service: String,
    pub key_name: String,
}

impl TryFrom<&SigningKey> for secp256k1::SigningKey {
    type Error = ClientError;
    fn try_from(signer: &SigningKey) -> Result<secp256k1::SigningKey, ClientError> {
        match &signer.key {
            Key::Mnemonic(phrase) => mnemonic_to_signing_key(phrase),
            Key::Keyring(params) => {
                let entry = Entry::new(&params.service, &params.key_name);
                mnemonic_to_signing_key(&entry.get_password()?)
            }
        }
    }
}

fn mnemonic_to_signing_key(mnemonic: &str) -> Result<secp256k1::SigningKey, ClientError> {
    let seed = bip32::Mnemonic::new(mnemonic, bip32::Language::English)
        .map_err(|_| ClientError::Mnemonic)?
        .to_seed("");
    Ok(
        bip32::XPrv::derive_from_path(seed, &DERVIATION_PATH.parse().unwrap())
            .map_err(|_| ClientError::DerviationPath)?
            .into(),
    )
}