Google sign-in url getter

googleApisClient.js

import { OAuth2Client } from 'google-auth-library';
const p = console.log;
/** APIs Explorer for OAuth2 v1: https://developers.google.com/apis-explorer/#p/oauth2/v1/ **/
const infoUrl = 'https://www.googleapis.com/oauth2/v1/userinfo?alt=JSON';

/**
 * information scope needed
 * reference: https://developers.google.com/identity/protocols/googlescopes
 * check: Google OAuth2 API, v2
 */
const scope = ['https://www.googleapis.com/auth/userinfo.email'];

/**
 * this establishes the connection
 * @return { OAuth2Client }
 */
function getOAuth2Client() {
  return new OAuth2Client('YOUR_CLIENT_ID', 'YOUR_CLIENT_SECRET', 'REDIRECT_URL');
}

/**
 * get the url for sign-in link
 * @param { OAuth2Client } client
 * @return { string }
 */
function getConnectionUrl(client) {
  return client.generateAuthUrl({
    access_type: 'offline',
    prompt: 'consent',
    scope: scope
  });
}

/** PUBLIC **/
/**
 * sso url
 * @return { string }
 */
function googleUrl() {
  return getConnectionUrl(getOAuth2Client());
}

export { googleUrl };