Facebook authentication with Firebase

To integrate facebook authentication in your firebase application, you need to first creat a new facebook application.

Go to https://developers.facebook.com/apps  and login with your credentials and click on Add a new App.

Next you need to create a new app id

Provide display name and choose your app category and click create.

Next, lookup for App ID and App secret.

Now click on setting on left panel and then advance on top panel and then  put this  

https://auth.firebase.com/v2/myApp/auth/facebook/callback in  Valid OAuth redirect URIs textbox, replace myApp with your app name.

click save changes.

So, we have successfully created a facebook application.

Now, click on Manage App button of you firebase application.

Now select login and auth tab from left panel and then select Facebook as the authentication provider. Fill your facebook App ID and App Seceret here.

You are all set with the configuration, now it’s time to code.

If your user don’t have an existing session than you can prompt your user to login and then invoke the facebook login popup with the following snippet

var ref = new Firebase("https://firebaseloginApp.firebaseio.com");
ref.authWithOAuthPopup("facebook", function(error, authData) {
if (error) {
console.log("Login Failed!", error);
} else {
console.log("Authenticated successfully", authData);
}
});

THANKS