Restrain access to users in GroupChat using Firebase - firebase

Question

I'm actually building a react-native & firebase group chat and I need to separate users in there proper channels. I have 6 channels with there proper chat and I don't want the fact that a user can create his channel. In my app, I want to authorize the access to 5 users in Group A, 8 users in B group, etc. I currently have a firebase database that look like this
and my rules are :
{
"rules": {
"GeneralMessage": {
".read": "root.child('user').child(auth.uid).child('inGeneral').child('GeneralMessage').child('read').val() === true",
".write": "root.child('user').child(auth.uid).child('inGeneral').child('GeneralMessage').child('write').val() === true"
}
}
}
But this don't let me access to read and write options.
Edit: The react native code where I push the chat in room.
import * as types from './actionTypes'
import firebaseService from '../../services/firebase'
const FIREBASE_REF_MESSAGES = firebaseService.database().ref('/GeneralMessage')
const FIREBASE_REF_MESSAGES_LIMIT = 20
export const sendMessage = message => {
return (dispatch) => {
dispatch(chatMessageLoading())
let currentUser = firebaseService.auth().currentUser
let createdAt = new Date().getTime()
let chatMessage = {
text: message,
createdAt: createdAt,
user: {
id: currentUser.uid,
email: currentUser.email,
}
}
FIREBASE_REF_MESSAGES.push().set(chatMessage, (error) => {
if (error) {
dispatch(chatMessageError(error.message))
} else {
dispatch(chatMessageSuccess())
}
})
}
}
export const updateMessage = text => {
return (dispatch) => {
dispatch(chatUpdateMessage(text))
}
}
export const loadMessages = () => {
return (dispatch) => {
FIREBASE_REF_MESSAGES.limitToLast(FIREBASE_REF_MESSAGES_LIMIT).on('value', (snapshot) => {
dispatch(loadMessagesSuccess(snapshot.val()))
}, (errorObject) => {
dispatch(loadMessagesError(errorObject.message))
})
}
}
const chatMessageLoading = () => ({
type: types.CHAT_MESSAGE_LOADING
})
const chatMessageSuccess = () => ({
type: types.CHAT_MESSAGE_SUCCESS
})
const chatMessageError = error => ({
type: types.CHAT_MESSAGE_ERROR,
error
})
const chatUpdateMessage = text => ({
type: types.CHAT_MESSAGE_UPDATE,
text
})
const loadMessagesSuccess = messages => ({
type: types.CHAT_LOAD_MESSAGES_SUCCESS,
messages
})
const loadMessagesError = error => ({
type: types.CHAT_LOAD_MESSAGES_ERROR,
error
})

Answer 1

Your datastructure and security rules are not completely matching. You have a rule for /user/user.uid/inGeneral/GeneralMessage/read but there isn't a GeneralMessage child under inGeneral in your datastructure.
With your current datastrcuture your rules have to look like this:
{
"rules": {
"GeneralMessage": {
".read": "root.child('user').child(auth.uid).child('inGeneral').child('general').val() === true",
".write": "root.child('user').child(auth.uid).child('inGeneral').child('general').val() === true"
}
}
}