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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.

    use util::{Arc, Mutex, RwLock, H256, Address};
    use ethkey::Signature;
    use account_provider::{self, AccountProvider};

    /// Everything that an Engine needs to sign messages.
    pub struct EngineSigner {
    	account_provider: Mutex<Arc<AccountProvider>>,
    	address: RwLock<Address>,
    	password: RwLock<Option<String>>,
    }

    impl Default for EngineSigner {
    	fn default() -> Self {
    		EngineSigner {
    			account_provider: Mutex::new(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(&self, ap: Arc<AccountProvider>, address: Address, password: String) {
    		*self.account_provider.lock() = ap;
    		*self.address.write()	= address;
    		*self.password.write() = 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.lock().sign(*self.address.read(), self.password.read().clone(), hash)
    	}

    	/// Signing address.
    	pub fn address(&self) -> Address {
    		self.address.read().clone()
    	}

    	/// Check if the given address is the signing address.
    	pub fn is_address(&self, address: &Address) -> bool {
    		*self.address.read() == *address
    	}
    }

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