56 lines
1.9 KiB
Rust
56 lines
1.9 KiB
Rust
// Copyright 2015-2020 Parity Technologies (UK) Ltd.
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// This file is part of Parity Ethereum.
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// Parity Ethereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity Ethereum is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity Ethereum. If not, see <http://www.gnu.org/licenses/>.
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use call_contract::CallContract;
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use ethabi::Address;
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use keccak_hash::keccak;
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use types::ids::BlockId;
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use_contract!(registrar, "res/registrar.json");
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// Maps a domain name to an Ethereum address
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const DNS_A_RECORD: &'static str = "A";
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/// Registrar contract interface
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pub trait RegistrarClient: CallContract + Send + Sync {
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/// Get address of the registrar itself
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fn registrar_address(&self) -> Option<Address>;
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/// Get address from registrar for the specified key.
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fn get_address(&self, key: &str, block: BlockId) -> Result<Option<Address>, String> {
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use registrar::registrar::functions::get_address::{encode_input, decode_output};
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let registrar_address = match self.registrar_address() {
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Some(address) => address,
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None => return Err("Registrar address not defined.".to_owned())
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};
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let hashed_key: [u8; 32] = keccak(key).into();
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let id = encode_input(hashed_key, DNS_A_RECORD);
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let address_bytes = self.call_contract(block, registrar_address, id)?;
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if address_bytes.is_empty() {
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return Ok(None)
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}
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let address = decode_output(&address_bytes).map_err(|e| e.to_string())?;
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if address.is_zero() {
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Ok(None)
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} else {
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Ok(Some(address))
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}
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}
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}
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