openethereum/ethcore/src/engines/signer.rs

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// Copyright 2015-2017 Parity Technologies (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity 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 General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
//! A signer used by Engines which need to sign messages.
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use std::sync::Arc;
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use bigint::hash::H256;
use util::Address;
use ethkey::Signature;
use account_provider::{self, AccountProvider};
/// Everything that an Engine needs to sign messages.
pub struct EngineSigner {
account_provider: Arc<AccountProvider>,
address: Option<Address>,
password: Option<String>,
}
impl Default for EngineSigner {
fn default() -> Self {
EngineSigner {
account_provider: Arc::new(AccountProvider::transient_provider()),
address: Default::default(),
password: Default::default(),
}
}
}
impl EngineSigner {
/// Set up the signer to sign with given address and password.
pub fn set(&mut self, ap: Arc<AccountProvider>, address: Address, password: String) {
self.account_provider = ap;
self.address = Some(address);
self.password = Some(password);
debug!(target: "poa", "Setting Engine signer to {}", address);
}
/// Sign a consensus message hash.
pub fn sign(&self, hash: H256) -> Result<Signature, account_provider::SignError> {
self.account_provider.sign(self.address.unwrap_or_else(Default::default), self.password.clone(), hash)
}
/// Signing address.
pub fn address(&self) -> Option<Address> {
self.address.clone()
}
/// Check if the given address is the signing address.
pub fn is_address(&self, address: &Address) -> bool {
self.address.map_or(false, |a| a == *address)
}
/// Check if the signing address was set.
pub fn is_some(&self) -> bool {
self.address.is_some()
}
}