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49 lines
1.2 KiB
JavaScript
49 lines
1.2 KiB
JavaScript
1 year ago
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const ethSigUtil = require('eth-sig-util');
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const keccak256 = require('keccak256');
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const EIP712Domain = [
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{ name: 'name', type: 'string' },
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{ name: 'version', type: 'string' },
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{ name: 'chainId', type: 'uint256' },
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{ name: 'verifyingContract', type: 'address' },
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];
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const Permit = [
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{ name: 'owner', type: 'address' },
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{ name: 'spender', type: 'address' },
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{ name: 'value', type: 'uint256' },
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{ name: 'nonce', type: 'uint256' },
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{ name: 'deadline', type: 'uint256' },
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];
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function bufferToHexString(buffer) {
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return '0x' + buffer.toString('hex');
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}
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function hexStringToBuffer(hexstr) {
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return Buffer.from(hexstr.replace(/^0x/, ''), 'hex');
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}
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async function domainSeparator({ name, version, chainId, verifyingContract }) {
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return bufferToHexString(
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ethSigUtil.TypedDataUtils.hashStruct(
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'EIP712Domain',
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{ name, version, chainId, verifyingContract },
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{ EIP712Domain },
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),
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);
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}
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async function hashTypedData(domain, structHash) {
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return domainSeparator(domain).then(separator =>
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bufferToHexString(keccak256(Buffer.concat(['0x1901', separator, structHash].map(str => hexStringToBuffer(str))))),
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);
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}
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module.exports = {
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EIP712Domain,
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Permit,
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domainSeparator,
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hashTypedData,
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};
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