Node.js Passport integration Google Passport authentication
Example
We have simple module available in npm for goggle authetication name passport-google-oauth20
Consider the following example In this example have created a folder namely config having the passport.js and google.js file in the root directory. In your app.js include the following
var express = require('express');
var session = require('express-session');
var passport = require('./config/passport'); // path where the passport file placed
var app = express();
passport(app);
// other code to initailize the server , error handle
In the passport.js file in the config folder include the following code
var passport = require ('passport'),
google = require('./google'),
User = require('./../model/user'); // User is the mongoose model
module.exports = function(app){
app.use(passport.initialize());
app.use(passport.session());
passport.serializeUser(function(user, done){
done(null, user);
});
passport.deserializeUser(function (user, done) {
done(null, user);
});
google();
};
In the google.js file in the same config folder include following
var passport = require('passport'),
GoogleStrategy = require('passport-google-oauth20').Strategy,
User = require('./../model/user');
module.exports = function () {
passport.use(new GoogleStrategy({
clientID: 'CLIENT ID',
clientSecret: 'CLIENT SECRET',
callbackURL: "http://localhost:3000/auth/google/callback"
},
function(accessToken, refreshToken, profile, cb) {
User.findOne({ googleId : profile.id }, function (err, user) {
if(err){
return cb(err, false, {message : err});
}else {
if (user != '' && user != null) {
return cb(null, user, {message : "User "});
} else {
var username = profile.displayName.split(' ');
var userData = new User({
name : profile.displayName,
username : username[0],
password : username[0],
facebookId : '',
googleId : profile.id,
});
// send email to user just in case required to send the newly created
// credentails to user for future login without using google login
userData.save(function (err, newuser) {
if (err) {
return cb(null, false, {message : err + " !!! Please try again"});
}else{
return cb(null, newuser);
}
});
}
}
});
}
));
};
Here in this example, if user is not in DB then creating a new user in DB for local reference using the field name googleId in user model.
