vue-google-oauth2-gapi

Handling Google sign-in and sign-out for Vue.js applications

Forked from https://github.com/guruahn/vue-google-oauth2

Same as fork but allows you to override options and a few other bug fixes.

This package contains Google API script loading before calling that (it was required for my project and I wasn't able to wait for merge my PR into repository forked from)

Installation

npm install vue-google-oauth2-gapi

Initialization

import GAuth from 'vue-google-oauth2-gapi'

Vue.use(GAuth, {clientId: '4XXXXXXXX93-2gqknkvdjfkdfkvb8uja2k65sldsms7qo9.apps.googleusercontent.com', scope: 'profile email https://www.googleapis.com/auth/plus.login'})

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

Frontend-side(Vue.js)

this.$gAuth.getAuthCode(function (authorizationCode) {
	//on success
	this.$http.post('http://your-backend-server.com/auth/google', { code: authorizationCode, redirect_uri: 'postmessage' }).then(function (response) {

	})
}, function (error) {
	//on fail do something
})

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.

Backend-side(Golang)

auth_code := ac.Code //from front-end side
// generate a config of oauth
conf := &oauth2.Config{
	ClientID:     "XXXXXXXX",
	ClientSecret: "XXXXXXXX",
	RedirectURL:  "postmessage",
	Scopes: []string{
		"profile",
		"email",
		"https://www.googleapis.com/auth/plus.login",
	},
	Endpoint: "XXXXXX",
}
// exchange to token inclued refresh_token from code
token, err = conf.Exchange(oauth2.NoContext, auth_code)
if err != nil {
		sErr := NewStatusErr(401, err.Error(), "Unauthorized")
		return nil, &sErr
}

Note, RedirectURL must be postmessage!!

(b) Alternatively, if you would like to directly get back the access_token and id_token

this.$gAuth.signIn(function (user) {
	//on success do something
	console.log('user', user)
}, function (error) {
	//on fail do something
})

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

this.$gAuth.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