vue-google-oauth

Handling Google sign-in and sign-out for Vue.js applications
Forked from https://github.com/simmatrix/vue-google-auth
Same as fork but allows you to override options and a few other bug fixes.

Installation

npm install vue-google-oauth

Initialization

import GoogleAuth from 'vue-google-oauth'

Vue.use(GoogleAuth, { client_id: 'xxxxxxxxxx-xxxxxxxxxxxxxxxxxxxxxxxxxx.apps.googleusercontent.com' })
Vue.googleAuth().load()

Ideally you shall place this in your app entry file, e.g. src/main.js

Usage - Sign-in

(a) Handling Google sign-in, getting the one-time authorization code from Google

import Vue from 'vue'

Vue.googleAuth().signIn(function (authorizationCode) {

  // things to do when sign-in succeeds

  // You can send the authorizationCode to your backend server for further processing, for example
  this.$http.post('http://your/backend/server', { code: authorizationCode, redirect_uri: 'postmessage' }).then(function (response) {
    if (response.body) {
      // ...
    }
  }, function (error) {
    console.log(error)
  })

}, function (error) {
  // things to do when sign-in fails
))

The authorizationCode that is being returned is the one-time code that you can send to your backend server, so that the server can exchange for its own access token and refresh token.

(b) Alternatively, if you would like to directly get back the accesstoken and idtoken

import Vue from 'vue'

// Just add in this line
Vue.googleAuth().directAccess()

Vue.googleAuth().signIn(function (googleUser) {
  // things to do when sign-in succeeds
}, function (error) {
  // things to do when sign-in fails
))

The googleUser object that is being returned will be:

{
  "token_type": "Bearer",
  "access_token": "xxx",
  "scope": "xxx",
  "login_hint": "xxx",
  "expires_in": 3600,
  "id_token": "xxx",
  "session_state": {
    "extraQueryParams": {
      "authuser": "0"
    }
  },
  "first_issued_at": 1234567891011,
  "expires_at": 1234567891011,
  "idpId": "google"
}

Usage - Sign-out

Handling Google sign-out

import Vue from 'vue'

Vue.googleAuth().signOut(function () {
  // things to do when sign-out succeeds
}, function (error) {
  // things to do when sign-out fails
))

Additional Help

Do refer to this sample login page HTML file.
If you are curious of how the entire Google sign-in flow works, please refer to the diagram below