84 lines
3.0 KiB
JavaScript
84 lines
3.0 KiB
JavaScript
// Copyright 2015, 2016 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 { isHex } from './types';
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import Func from '../../abi/spec/function';
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import { fromParamType, toParamType } from '../../abi/spec/paramType/format';
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export function decodeCallData (data) {
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if (!isHex(data)) {
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throw new Error('Input to decodeCallData should be a hex value');
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}
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if (data.substr(0, 2) === '0x') {
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return decodeCallData(data.slice(2));
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} else if (data.length < 8) {
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throw new Error('Input to decodeCallData should be method signature + data');
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}
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const signature = data.substr(0, 8);
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const paramdata = data.substr(8);
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return {
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signature: `0x${signature}`,
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paramdata: `0x${paramdata}`
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};
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}
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export function decodeMethodInput (methodAbi, paramdata) {
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if (!methodAbi) {
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throw new Error('decodeMethodInput should receive valid method-specific ABI');
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} else if (paramdata && paramdata.length) {
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if (!isHex(paramdata)) {
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throw new Error('Input to decodeMethodInput should be a hex value');
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} else if (paramdata.substr(0, 2) === '0x') {
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return decodeMethodInput(methodAbi, paramdata.slice(2));
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} else if (paramdata.length % 64 !== 0) {
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throw new Error('Parameter length in decodeMethodInput not a multiple of 64 characters');
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}
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}
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return new Func(methodAbi).decodeInput(paramdata).map((decoded) => decoded.value);
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}
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// takes a method in form name(...,types) and returns the inferred abi definition
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export function methodToAbi (method) {
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const length = method.length;
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const typesStart = method.indexOf('(');
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const typesEnd = method.indexOf(')');
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if (typesStart === -1) {
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throw new Error(`Missing start ( in call to decodeMethod with ${method}`);
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} else if (typesEnd === -1) {
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throw new Error(`Missing end ) in call to decodeMethod with ${method}`);
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} else if (typesEnd < typesStart) {
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throw new Error(`End ) is before start ( in call to decodeMethod with ${method}`);
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} else if (typesEnd !== length - 1) {
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throw new Error(`Extra characters after end ) in call to decodeMethod with ${method}`);
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}
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const name = method.substr(0, typesStart);
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const types = method.substr(typesStart + 1, length - (typesStart + 1) - 1).split(',');
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const inputs = types.filter((_type) => _type.length).map((_type) => {
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const type = fromParamType(toParamType(_type));
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return { type };
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});
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return { type: 'function', name, inputs };
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}
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