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A utility library for working with ERC-4337
40 lines • 1.54 kB
JavaScript
import { encodeAbiParameters, getTypesForEIP712Domain, hashTypedData, validateTypedData } from "viem";
export async function signTypedData(parameters) {
const { admin, accountAddress, chainId, ...typedData } = parameters;
const isSelfVerifyingContract = typedData.domain?.verifyingContract?.toLowerCase() === accountAddress;
// If this is a self-verifying contract, we can use the admin's signature
if (isSelfVerifyingContract) {
return admin.signTypedData({
...typedData
});
}
const { message, primaryType, types: _types, domain } = typedData;
const types = {
EIP712Domain: getTypesForEIP712Domain({
domain: domain
}),
..._types
};
// Need to do a runtime validation check on addresses, byte ranges, integer ranges, etc
// as we can't statically check this with TypeScript.
validateTypedData({
domain,
message,
primaryType,
types
});
const typedHash = hashTypedData({ message, primaryType, types, domain });
const wrappedMessageHash = encodeAbiParameters([{ type: "bytes32" }], [typedHash]);
return admin.signTypedData({
domain: {
name: "Account",
version: "1",
chainId,
verifyingContract: accountAddress
},
primaryType: "AccountMessage",
types: { AccountMessage: [{ name: "message", type: "bytes" }] },
message: { message: wrappedMessageHash }
});
}
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