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46 lines
1.1 KiB
46 lines
1.1 KiB
const { ethers } = require('ethers');
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const types = require('./eip712-types');
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async function getDomain(contract) {
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const { fields, name, version, chainId, verifyingContract, salt, extensions } = await contract.eip712Domain();
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if (extensions.length > 0) {
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throw Error('Extensions not implemented');
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}
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const domain = {
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name,
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version,
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// TODO: remove check when contracts are all migrated to ethers
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chainId: web3.utils.isBN(chainId) ? chainId.toNumber() : chainId,
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verifyingContract,
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salt,
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};
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for (const [i, { name }] of types.EIP712Domain.entries()) {
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if (!(fields & (1 << i))) {
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delete domain[name];
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}
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}
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return domain;
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}
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function domainType(domain) {
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return types.EIP712Domain.filter(({ name }) => domain[name] !== undefined);
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}
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function hashTypedData(domain, structHash) {
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return ethers.solidityPackedKeccak256(
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['bytes', 'bytes32', 'bytes32'],
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['0x1901', ethers.TypedDataEncoder.hashDomain(domain), structHash],
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);
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}
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module.exports = {
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types,
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getDomain,
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domainType,
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domainSeparator: ethers.TypedDataEncoder.hashDomain,
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hashTypedData,
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};
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