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// Copyright 2018 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, ptr};

#[derive(Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct Password(String);

impl fmt::Debug for Password {
	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "Password(******)")
    }
}

impl Password {
	pub fn as_bytes(&self) -> &[u8] {
		self.0.as_bytes()
	}

	pub fn as_str(&self) -> &str {
		self.0.as_str()
	}
}

// Custom drop impl to zero out memory.
impl Drop for Password {
	fn drop(&mut self) {
		unsafe {
			for byte_ref in self.0.as_mut_vec() {
				ptr::write_volatile(byte_ref, 0)
			}
		}
	}
}

impl From<String> for Password {
	fn from(s: String) -> Password {
		Password(s)
	}
}

impl<'a> From<&'a str> for Password {
	fn from(s: &'a str) -> Password {
		Password::from(String::from(s))
	}
}