Google Login OAuth 2.0 flow

Google oAuth flow to retrieve access & refresh token

Feature

This package can be used to get Google access token and refresh token for an user access token.

Implements a server-Side flow for login with Google, similar to one provided by Facebook or Twitter.

This can be used to get User Access Token to make API calls to Google, like getting access to Google My Business

Installation

• Clone as a Git repository

  git clone https://github.com/knitesh/google-login.git

• Install as a node_module

  npm i google-oauth-login --save
  
  OR
  
  npm install google-oauth-login --save

Usage

To initialize Google oAuth function

new GoogleLogin(config)

where config will be

const config = {
  clientId,
  clientSecret,
  scope,
  redirectUri,
}

To get oAuth URl for user consent and login

await google.getGoogleOauthUrl()

To extract code received from Google

await google.getOauthCodeAsync(oAuthParam)

To get access token and refresh token(if accessType = offline)

await google.getAccessTokenAsync(oAuthParam)

Sample Express app

const express = require('express')
const GoogleLogin = require('google-oauth-login')

const app = express()
const port = 9000



const google = new GoogleLogin({
  clientId:<<your Google oAuth Client Id>,
  clientSecret: <<your Google oAuth Client Secret>,
  redirectUri: 'http://localhost:9000/google/oauth/callback',
  scope: 'https://www.googleapis.com/auth/userinfo.profile',
  accessType: 'offline', // to get refresh token pass access type: offline
  prompt: 'consent', // to prompt user everytime
})

app.get('/google/oauth', async (req, res) => {
  // generate the URL that Googl will use for login and consent dialog
  var result = await google.getGoogleOauthUrl()
  // redirect the user to consent screen
  res.redirect(result)
})

// This is the Authrized redirect URl that needs to be added to oAuth Client Id generation screen
// Google will  send the code and related scope as query string to this Url
app.get('/google/oauth/callback', async (req, res) => {
  const oAuthParam = {
    code: req.query.code,
    scope: req.query.scope,
  }
  // if you just need the code
  const code = await google.getOauthCodeAsync(oAuthParam)
  // get the access token, token_type  so that you can make additional call to google
  var result = await google.getAccessTokenAsync(oAuthParam)
  // This example just showing result returned in a browers
  // You should store this in a secure database and never expose to client app
  res.send(JSON.stringify(result))
})

app.get('/', (req, res) => {
  const _user = req.session && req.session.user
  if (_user) {
    res.send(JSON.stringify(_user))
  } else {
    res.send('Login with Google')
  }
})

app.listen(port, () => {
  console.log(`Example app listening at http://localhost:${port}`)
})