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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/>.

    use std::fmt;
    use std::io::Error as IoError;
    use ethkey::Error as EthKeyError;
    use crypto::Error as EthCryptoError;

    #[derive(Debug)]
    pub enum Error {
    	Io(IoError),
    	InvalidPassword,
    	InvalidSecret,
    	InvalidCryptoMeta,
    	InvalidAccount,
    	InvalidMessage,
    	InvalidKeyFile(String),
    	VaultsAreNotSupported,
    	UnsupportedVault,
    	InvalidVaultName,
    	VaultNotFound,
    	CreationFailed,
    	EthKey(EthKeyError),
    	EthCrypto(EthCryptoError),
    	Custom(String),
    }

    impl fmt::Display for Error {
    	fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
    		let s = match *self {
    			Error::Io(ref err) => err.to_string(),
    			Error::InvalidPassword => "Invalid password".into(),
    			Error::InvalidSecret => "Invalid secret".into(),
    			Error::InvalidCryptoMeta => "Invalid crypted metadata".into(),
    			Error::InvalidAccount => "Invalid account".into(),
    			Error::InvalidMessage => "Invalid message".into(),
    			Error::InvalidKeyFile(ref reason) => format!("Invalid key file: {}", reason),
    			Error::VaultsAreNotSupported => "Vaults are not supported".into(),
    			Error::UnsupportedVault => "Vault is not supported for this operation".into(),
    			Error::InvalidVaultName => "Invalid vault name".into(),
    			Error::VaultNotFound => "Vault not found".into(),
    			Error::CreationFailed => "Account creation failed".into(),
    			Error::EthKey(ref err) => err.to_string(),
    			Error::EthCrypto(ref err) => err.to_string(),
    			Error::Custom(ref s) => s.clone(),
    		};

    		write!(f, "{}", s)
    	}
    }

    impl From<IoError> for Error {
    	fn from(err: IoError) -> Self {
    		Error::Io(err)
    	}
    }

    impl From<EthKeyError> for Error {
    	fn from(err: EthKeyError) -> Self {
    		Error::EthKey(err)
    	}
    }

    impl From<EthCryptoError> for Error {
    	fn from(err: EthCryptoError) -> Self {
    		Error::EthCrypto(err)
    	}
    }

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