50 lines
1.5 KiB
JavaScript
50 lines
1.5 KiB
JavaScript
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity 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 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. If not, see <http://www.gnu.org/licenses/>.
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import { keccak_256 } from 'js-sha3'; // eslint-disable-line camelcase
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import { fromParamType } from '../spec/paramType/format';
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export function eventSignature (eventName, params) {
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const { strName, name } = parseName(eventName);
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const types = (params || []).map(fromParamType).join(',');
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const id = `${strName}(${types})`;
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const signature = strName ? keccak_256(id) : '';
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return { id, name, signature };
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}
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export function methodSignature (methodName, params) {
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const { id, name, signature } = eventSignature(methodName, params);
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return { id, name, signature: signature.substr(0, 8) };
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}
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function parseName (name) {
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const strName = `${name || ''}`;
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const idx = strName.indexOf('(');
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if (idx === -1) {
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return { strName, name };
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}
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const trimmedName = strName.slice(0, idx);
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return {
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strName: trimmedName,
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name: trimmedName
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};
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}
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