Login/Authentication Process using Ember

ApplicationRoute

var ApplicationRoute = Ember.Route.extend({
	beforeModel: function () {
		var self = this,
				user = this.controllerFor('currentUser');

		if (user.get('isLoggedIn')) {
			var verifyPromise = user.verifyToken();
			
			return verifyPromise.then(function(userName) {
				self.transitionTo('/');
			}, function (error) {
				self.transitionTo('/auth/login');
			});
		} else {
			self.transitionTo('/auth/login');
		}
	}
});

export default ApplicationRoute;

Current User Controller

var CurrentUser = Ember.Controller.extend({
	firstName: '',
	lastName: '',
	email: '',
	currentProject: null,
	currentTable: null,
	activeToken: null,
	isLoggedIn: Ember.computed.notEmpty('activeToken'),

	fullName: function () {
		return this.firstName + ' ' + this.lastName;
	}.property('firstName', 'lastName'),

	init: function () {
		
		try {
			var user = JSON.parse(localStorage.currentUser);
			this.setProperties(user);
		} catch (err) {}
		try {
			var token = JSON.parse(localStorage.activeToken);
			this.set('activeToken', token);
		} catch (err) {}
	},

	verifyToken: function () {
		var self = this;
		var token = this.get('activeToken');

		var promise = Ember.RSVP.Promise(function(resolve, reject) {
			gapi.auth.setToken(token);
			self.loadUserDetails().then(resolve, function() {
				self.authenticateUser(true).then(resolve, reject);
			});
		});

		return promise;
	},

	loadUserDetails: function () {
		var self = this;
		var promise = Ember.RSVP.Promise(function(resolve, reject) {

			gapi.client.load('oauth2','v2', function () {
				var request = gapi.client.oauth2.userinfo.get();
				request.execute(function(result) {
					if (!result.error) {
						self.updateUserDetails(result);
						resolve();
					} else {
						reject(result.message);
					}
				});
			});
		});

		return promise;
	},

	updateUserDetails: function (newDetails) {
		this.setProperties({
			firstName: newDetails.given_name,
			lastName: newDetails.family_name,
			email: newDetails.email
		});

		localStorage.currentUser = JSON.stringify(this.serialize());
	},

	authenticateUser: function (immediate) {
		var self = this;
		var promise = Ember.RSVP.Promise(function (resolve, reject) {
			var clientId = 'Some Client ID'; // WebApp

			var config = {
				'client_id': clientId,
				'immediate': !!immediate,
				'scope': ['https://www.googleapis.com/auth/bigquery',
					'https://www.googleapis.com/auth/plus.me',
					'https://www.googleapis.com/auth/userinfo.profile',
					'https://www.googleapis.com/auth/userinfo.email']
			};

			gapi.auth.authorize(config, function (token) {
				self.set('activeToken', token);
				localStorage.activeToken = JSON.stringify(token);

				resolve(token);
			});
		});

		return promise;
	},

	actions: {
		login: function () {
			var self = this;
			self.authenticateUser().then(function() {
				self.transitionToRoute('/');
			});
		}
	},
	serialize: function () {
		return {
			firstName: this.get('firstName'),
			lastName: this.get('lastName'),
			email: this.get('email'),
			currentProject: this.get('currentProject'),
			currentTable: this.get('currentTable')
		};
	}
});
export default CurrentUser;