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A utility library for working with ERC-4337
70 lines • 2.75 kB
JavaScript
import { Signature } from "ox";
import { encodeAbiParameters, hashMessage } from "viem";
import { signMessage as _signMessage } from "viem/actions";
import { isWebAuthnAccount } from "./isWebAuthnAccount.js";
import { wrapMessageHash } from "./wrapMessageHash.js";
export async function signMessage({ message, owner, accountAddress, kernelVersion: accountVersion, chainId }) {
if (isWebAuthnAccount(owner)) {
let messageContent;
if (typeof message === "string") {
// message is a string
messageContent = wrapMessageHash(hashMessage(message), {
kernelVersion: accountVersion,
accountAddress,
chainId
// chainId: client.chain
// ? client.chain.id
// : await client.extend(publicActions).getChainId()
});
}
else if ("raw" in message && typeof message.raw === "string") {
// message.raw is a Hex string
messageContent = message.raw;
}
else if ("raw" in message && message.raw instanceof Uint8Array) {
// message.raw is a ByteArray
messageContent = message.raw.toString();
}
else {
throw new Error("Unsupported message format");
}
const { signature: signatureData, webauthn } = await owner.sign({
hash: messageContent
});
const signature = Signature.fromHex(signatureData);
// encode signature
const encodedSignature = encodeAbiParameters([
{ name: "authenticatorData", type: "bytes" },
{ name: "clientDataJSON", type: "string" },
{ name: "responseTypeLocation", type: "uint256" },
{ name: "r", type: "uint256" },
{ name: "s", type: "uint256" },
{ name: "usePrecompiled", type: "bool" }
], [
webauthn.authenticatorData,
webauthn.clientDataJSON,
BigInt(webauthn.typeIndex),
BigInt(signature.r),
BigInt(signature.s),
false // TODO: check if it is a RIP 7212 supported network
]);
return encodedSignature;
}
if (accountVersion === "0.2.1" || accountVersion === "0.2.2") {
return owner.signMessage({
message
});
}
const wrappedMessageHash = wrapMessageHash(hashMessage(message), {
kernelVersion: accountVersion,
accountAddress,
chainId
// chainId: client.chain
// ? client.chain.id
// : await client.extend(publicActions).getChainId()
});
return owner.signMessage({
message: { raw: wrappedMessageHash }
});
}
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