test-EIP-712.js

/*
Ref : https://medium.com/metamask/eip712-is-coming-what-to-expect-and-how-to-use-it-bb92fd1a7a26
Signature was created using the API eth_signTypedData_v3
Address recovered via eth-sig-utils
*/


const sigUtil = require('eth-sig-util')


const domain = [
  { name: "name", type: "string" },
  { name: "version", type: "string" },
  { name: "chainId", type: "uint256" },
  { name: "verifyingContract", type: "address" },
  { name: "salt", type: "bytes32" },
];
const bid = [
  { name: "amount", type: "uint256" },
  { name: "bidder", type: "Identity" },
];
const identity = [
  { name: "userId", type: "uint256" },
  { name: "wallet", type: "address" },
];

const domainData = {
  name: "My amazing dApp",
  version: "2",
  chainId: parseInt(1),
  verifyingContract: "0x1C56346CD2A2Bf3202F771f50d3D14a367B48070",
  salt: "0xf2d857f4a3edcb9b78b4d503bfe733db1e3f6cdc2b7971ee739626c97e86a558"
};
var message = {
  amount: 100,
  bidder: {
    userId: 323,
    wallet: "0x3333333333333333333333333333333333333333"
  }
};

const data = {
  types: {
    EIP712Domain: domain,
    Bid: bid,
    Identity: identity,
  },
  domain: domainData,
  primaryType: "Bid",
  message: message
};


let signature = "0xabc0f807b4797694b4a98a271faa239c095ed6f56b45a78f81834dab66ec99666893ccc70f9ef119931775bfaf24c496c28472d28522bf606bca0cf0601f3d9d1b"

let messageParams = {}

messageParams.sig = signature;
messageParams.data = data

console.log(sigUtil.recoverTypedSignature(messageParams));