Mirror a Firebase to a second Firebase

mirror.js

var Firebase = require('firebase');

var fromRef = new Firebase('https://<FROM-FIREBASE>.firebaseio.com');
var toRef = new Firebase('https://<TO-FIREBASE>.firebaseio.com');

function main(){
	mirrorRef(fromRef,toRef);
}

function mirrorRef(fromReference, toReference){
	fromReference.on('child_added', function(snapshot){
		if (snapshot.hasChildren()){
			mirrorRef(fromReference.child(snapshot.key()),toReference.child(snapshot.key()));
		} else {
			snapshot.ref().on('value', function(child_snap){
				toReference.child(child_snap.key()).set(child_snap.val());
			});
		}
	});

	fromReference.on('child_removed', function(snapshot){
		if (snapshot.hasChildren()){
			mirrorRef(fromReference.child(snapshot.key()),toReference.child(snapshot.key()));
		} else {
			toReference.child(snapshot.key()).remove();
			snapshot.ref().off();
		}
	});
}

main();