import Web3 from 'web3';
import Web3Token from 'web3-token';

// Connection to MetaMask wallet
const web3 = new Web3(ethereum);
await ethereum.request({ method: 'eth_requestAccounts'});

// getting address from which we will sign message
const address = (await web3.eth.getAccounts())[0];

// generating a token with 1 day of expiration time
const token = await Web3Token.sign(msg => web3.eth.personal.sign(msg, address), '1d');

// attaching token to authorization header ... for example

import { ethers } from "ethers";
import Web3Token from 'web3-token';

// Connection to MetaMask wallet
const provider = new ethers.providers.Web3Provider(window.ethereum);
const signer = provider.getSigner();

// generating a token with 1 day of expiration time
const token = await Web3Token.sign(async msg => await signer.signMessage(msg), '1d');

// attaching token to authorization header ... for example

const Web3Token = require('web3-token');

// getting token from authorization header ... for example
const token = req.headers['Authorization']

const { address, body } = await Web3Token.verify(token);

// now you can find that user by his address 
// (better to do it case insensitive)
req.user = await User.findOne({ address });

const generateToken = async () => {
  if (!window.ethereum) {
    return console.log('Please install and activate the metamask extension!');
  }

  const provider = new ethers.providers.Web3Provider(window.ethereum);
  const signer = provider.getSigner();

  try {
    return await Web3Token.sign(async msg => {
      try {
        return await signer.signMessage(msg);
      }
      catch (err) {
        const { reason } = err;
        if (reason === "unknown account #0") {
          return console.log('Have you unlocked metamask and are connected to this page?')
        }

        console.log(err.toString());
      }
    }, '1d');
  }
  catch (err) {
    if (/returns a signature/.test(err.toString())) {
      return;
    }
    console.log(err.toString());
  }
}

// I assume here a lot of things to be imported 😀

const token = await Web3Token.sign(async msg => await signer.signMessage(msg), {
  domain: 'worldofdefish.com',
  statement: 'I accept the WoD Terms of Service: https://service.org/tos',
  expires_in: '3 days',
  // won't be able to use this token for one hour
  not_before: new Date(Date.now() + (3600 * 1000)),
  nonce: 11111111,
});

const { address, body } = await Web3Token.verify(token, {
  // verify that received token is signed only for our domain
  domain: 'worldofdefish.com'
});