firebase can be enabled through config

config.json.example

@@ -72,6 +72,7 @@
     },
     "FIREBASE": {
         "APP": "app-name",
-        "SECRET": "secret"
+        "SECRET": "secret",
+        "ENABLED": "false"
     }
 }

website/src/libs/firebase.js

@@ -1,13 +1,16 @@
 var Firebase = require('firebase');
 var nconf = require('nconf');
-var isProd = false //nconf.get('NODE_ENV') === 'production';
-var firebaseRef;
+var isProd = nconf.get('NODE_ENV') === 'production';
 var firebaseConfig = nconf.get('FIREBASE');
 
+var firebaseRef;
+var isFirebaseEnabled = (nconf.get('NODE_ENV') === 'production') && (firebaseConfig.ENABLED === 'true');
+
 // Setup
-if(isProd){
+if(isFirebaseEnabled){
   firebaseRef = new Firebase('https://' + firebaseConfig.APP + '.firebaseio.com');
 
+  // TODO what happens if an op is sent before client is authenticated?
   firebaseRef.authWithCustomToken(firebaseConfig.SECRET, function(err, authData){
     // TODO it's ok to kill the server here? what if FB is offline?
     if(err) throw new Error('Impossible to authenticate Firebase');
@@ -17,7 +20,7 @@ if(isProd){
 var api = module.exports = {};
 
 api.updateGroupData = function(group){
-  if(!isProd) return;
+  if(!isFirebaseEnabled) return;
   // TODO is throw ok? we don't have callbacks
   if(!group) throw new Error('group is required.');
   // Return in case of tavern (comparison working because we use string for _id)
@@ -30,7 +33,7 @@ api.updateGroupData = function(group){
 };
 
 api.addUserToGroup = function(groupId, userId){
-  if(!isProd) return;
+  if(!isFirebaseEnabled) return;
   if(!userId || !groupId) throw new Error('groupId, userId are required.');
   if(groupId === 'habitrpg') return;
 
@@ -42,7 +45,7 @@ api.addUserToGroup = function(groupId, userId){
 };
 
 api.removeUserFromGroup = function(groupId, userId){
-  if(!isProd) return;
+  if(!isFirebaseEnabled) return;
   if(!userId || !groupId) throw new Error('groupId, userId are required.');
   if(groupId === 'habitrpg') return;
 
@@ -54,7 +57,7 @@ api.removeUserFromGroup = function(groupId, userId){
 };
 
 api.deleteGroup = function(groupId){
-  if(!isProd) return;
+  if(!isFirebaseEnabled) return;
   if(!groupId) throw new Error('groupId is required.');
   if(groupId === 'habitrpg') return; 
 
@@ -70,7 +73,7 @@ api.deleteGroup = function(groupId){
 // FIXME not really necessary as long as we only store room data,
 // as empty objects are automatically deleted
 api.deleteUser = function(userId){
-  if(!isProd) return;
+  if(!isFirebaseEnabled) return;
   if(!userId) throw new Error('userId is required.');
 
   firebaseRef.child('users/' + userId)