Authenticating with Auth0

const auth0 = require('auth0');
const ethers = require('ethers');

const AUTH0_DOMAIN = 'validationcloud.us.auth0.com';

async function getAuth0Credentials() {
  const clientId = process.env.CLIENT_ID;
  if (!clientId) {
    throw 'CLIENT_ID environment variable must be defined';
  }
  const clientSecret = process.env.CLIENT_SECRET;
  if (!clientSecret) {
    throw 'CLIENT_SECRET environment variable must be defined';
  }
  return { clientId, clientSecret };
}

async function getToken() {
  const { clientId, clientSecret } = await getAuth0Credentials();
  const authClient = new auth0.AuthenticationClient({
    domain: AUTH0_DOMAIN,
    clientId: clientId,
    clientSecret: clientSecret,
  });
  const { data: tokens } = await authClient.oauth.clientCredentialsGrant({
    audience: 'staking',
  });
  return tokens.access_token;
}