dexorder

lib_openzeppelin_contracts/test/helpers/eip712.js

@@ -0,0 +1,45 @@
+const { ethers } = require('hardhat');
+const types = require('./eip712-types');
+
+async function getDomain(contract) {
+  const { fields, name, version, chainId, verifyingContract, salt, extensions } = await contract.eip712Domain();
+
+  if (extensions.length > 0) {
+    throw Error('Extensions not implemented');
+  }
+
+  const domain = {
+    name,
+    version,
+    chainId,
+    verifyingContract,
+    salt,
+  };
+
+  for (const [i, { name }] of types.EIP712Domain.entries()) {
+    if (!(fields & (1 << i))) {
+      delete domain[name];
+    }
+  }
+
+  return domain;
+}
+
+function domainType(domain) {
+  return types.EIP712Domain.filter(({ name }) => domain[name] !== undefined);
+}
+
+function hashTypedData(domain, structHash) {
+  return ethers.solidityPackedKeccak256(
+    ['bytes', 'bytes32', 'bytes32'],
+    ['0x1901', ethers.TypedDataEncoder.hashDomain(domain), structHash],
+  );
+}
+
+module.exports = {
+  getDomain,
+  domainType,
+  domainSeparator: ethers.TypedDataEncoder.hashDomain,
+  hashTypedData,
+  ...types,
+};