feat: validate typedData via viem lib

Author: ieow

package-lock.json

@@ -26,7 +26,8 @@
     "@web3auth/base": "^9.5.2",
     "@web3auth/base-provider": "^9.5.2",
     "@web3auth/ethereum-provider": "^9.5.2",
-    "ethers": "^6.13.4"
+    "ethers": "^6.13.4",
+    "viem": "^2.22.5"
   },
   "peerDependencies": {
     "@babel/runtime": "7.x"

packages/providers/ethereum-mpc-provider/package.json

@@ -5,14 +5,14 @@ import { log } from "@web3auth/base";
 import {
   IProviderHandlers,
   MessageParams,
-  SignTypedDataMessageV4,
   SignTypedDataVersion,
   TransactionFormatter,
   TransactionParams,
   TypedMessageParams,
   validateTypedSignMessageDataV4,
 } from "@web3auth/ethereum-provider";
-import { hashMessage, Signature, TypedDataEncoder } from "ethers";
+import { hashMessage, Signature } from "ethers";
+import { hashTypedData, hexToBytes, validateTypedData } from "viem";
 
 async function signTx(
   txParams: TransactionParams & { gas?: string },
@@ -89,9 +89,10 @@ async function signTypedData(
   if (data === null || data === undefined) {
     throw new Error("Missing data parameter");
   }
-  const message: SignTypedDataMessageV4 = typeof data === "string" ? JSON.parse(data) : data;
+  const message = typeof data === "string" ? JSON.parse(data) : data;
+  validateTypedData(message);
 
-  const { v, r, s } = await sign(Buffer.from(TypedDataEncoder.hash(message.domain, message.types, message.message).slice(2), "hex"));
+  const { v, r, s } = await sign(Buffer.from(hexToBytes(hashTypedData(message))));
 
   let modifiedV = v;
   if (modifiedV <= 1) {
@@ -170,7 +171,6 @@ export function getProviderHandlers({
       const chainId = await providerEngineProxy.request<unknown, string>({ method: "eth_chainId" });
       await validateTypedSignMessageDataV4(msgParams, chainId);
       const data = typeof msgParams.data === "string" ? JSON.parse(msgParams.data) : msgParams.data;
-      if (data.types.EIP712Domain) delete data.types.EIP712Domain;
       const sig = signTypedData(sign, data, SignTypedDataVersion.V4);
       return sig;
     },