initializer-session.js

/* Original source: https://gist.github.com/oskarrough/914653b03d886c015320
 * Modified fork:  	https://gist.github.com/consideRatio/761c6286158e70feaed7
 *
 * Working authentication with
 * Firebase 2.0.x + Ember.js 1.8.1 + Ember Data Canary + EmberFire 1.3.0 + Ember CLI
 * works for me! oskar@rough.dk
 *
 * Note: this assumes you've set up login on your Firebase,
 * only handles Google and Facebook for now.
 * 
 * Before usage:
 * Decide on how you want your logout function to behave, check the comments in that function
 *
 * Usage:
 * In your templates: <button {{action 'login' 'google'}}>Log in with Google</button>
 * In your actions (on the application route for example):
	login: function(provider) {
		this.session.login(provider, {scope: 'email'});
	},

	logout: function() {
		this.session.logout();
	},
 * In your environment file (ember-cli)
 	var ENV = {
 		... stuff ...
		firebaseURL: 'https://YOUR-FIREBASE-NAME.firebaseio.com',
		... stuff ...
	};
 */

/* global md5 */
import Ember from 'ember'; 
import ENV from '../config/environment';

var ref = new window.Firebase(ENV.firebaseURL);
export function initialize(container, app) {
	// session object is nested here as we need access to the container to get the store
	var session = Ember.Object.extend({
		
		// initial state
		authed: false,

		// get access to the ember data store
		store: container.lookup('store:main'),

		revokeAppAccess: function() {
			if (this.get('authData')) {
				var url, params;
				switch (this.get('authData.provider')) {
					case "google":
						url 	= 'https://accounts.google.com/o/oauth2/revoke';
						params 	= { token: this.get('authData.google.accessToken') };
						break;
					case "facebook":
						url 	= 'https://graph.facebook.com/v2.2/me/permissions';
						params 	= { access_token: this.get('authData.facebook.accessToken'), method: 'delete' };
						break;
					default:
						return;
				}
				Ember.$.ajax(url, {
					type: 'POST',
					data: params,
					crossDomain: true,
					dataType: 'jsonp',
					contentType: 'application/json'
				});
			}
		},
				
		init: function() {
			// on init try to login
			ref.onAuth(function(authData) {
				// Not authenticated
				if (!authData) {
					this.set('authed', false);
					this.set('authData', null);
					this.set('user', null);
					return false;
				}

				// Authenticated
				this.set('authed', true);
				this.set('authData', authData);
				this.afterAuthentication(authData.uid);
			}.bind(this));
		},

		// Call this from your Ember templates
		login: function(provider, options) {
			this._loginWithPopup(provider, options);
		},

		// Call this from your Ember templates
		logout: function() {
			// Uncommenting the line below will make the user able to switch account used
			// without leaving your webpage. The way I see it, that is the main goal of
			// having a logout button at all.
			// this.revokeAppAccess();
			ref.unauth();
		},

		// Default login method
		_loginWithPopup: function(provider, options) {
			var _this = this;
			// Ember.debug('logging in with popup');
			ref.authWithOAuthPopup(provider, function(error, authData) {
				if (error) {
					if (error.code === "TRANSPORT_UNAVAILABLE") {
						// fall-back to browser redirects, and pick up the session
						// automatically when we come back to the origin page
						_this._loginWithRedirect(provider, options);
					}
				} else if (authData) {
					// we're good!
					// this will automatically call the on ref.onAuth method inside init()
				}
			}, options);
		},

		// Alternative login with redirect (needed for Chrome on iOS)
		_loginWithRedirect: function(provider, options) {
			ref.authWithOAuthRedirect(provider, function(error, authData) {
				if (error) {
					
				} else if (authData) {
					// we're good!
					// this will automatically call the on ref.onAuth method inside init()
				}
			}, options);
		},

		// Runs after authentication
		// It either sets a new or already exisiting user
		afterAuthentication: function(userId) {
			var _this = this;

			// See if the user exists using native Firebase because of EmberFire problem with "id already in use"
			ref.child('participants').child(userId).once('value', function(snapshot) {
				var exists = (snapshot.val() !== null);
				userExistsCallback(userId, exists);
			});

			// Do the right thing depending on whether the user exists
			function userExistsCallback(userId, exists) {
				if (exists) {
					_this.existingUser(userId);
				} else {
					_this.createUser(userId);
				}
			}
		},

		// Existing user
		existingUser: function(userId) {
			this.store.find('participant', userId).then(function(user) {
				this.set('user', user);
			}.bind(this));
		},

		// Create a new user
		createUser: function(userId) {
			var _this = this;

			this.get('store').createRecord('participant', {
				id: userId,
				provider: this.get('authData.provider'),
				name: this.get('authData.facebook.displayName') || this.get('authData.google.displayName'),
				email: this.get('authData.facebook.email') || this.get('authData.google.email'),
				timestamps: [new Date().getTime()],
				stageId: 0
			}).save().then(function(user){

				// Proceed with the newly create user
				_this.set('user', user);
			});
		},

		// This is the last step in a successful authentication
		// Set the user (either new or existing)
		afterUser: function(user) {	
			this.set('user', user);
		}
	});

	// Register and inject the 'session' initializer into all controllers and routes
	app.register('session:main', session);
	app.inject('route', 'session', 'session:main');
	app.inject('controller', 'session', 'session:main');
}

export default {
	name: 'session',
	after: 'store', // Run the initializer after the store is ready

	initialize: initialize
}; 

Do you know how i'd fix the error "Uncaught Error: Firebase.authWithOAuthPopup failed: First argument must be a valid string."

It appears when I click on my login button...