Firebase Device Store

Automatically store Device and FCM Token information for Firebase Auth Users in Cloud Firestore.

This library is a proof of concept, and very much a work in progress.

Installation

Firebase Device Store requires Firebase v5.0.0 or later.

npm install --save firebase-device-store

Setup

The following Firebase libraries need to be enabled in your application:

import firebase from 'firebase/app';
import 'firebase/auth';
import 'firebase/firestore';
import 'firebase/messaging';

Example usage

import DeviceStore from 'firebase-device-store';

const deviceStore = DeviceStore(firebase.app(), 'user-devices');

Documentation

Firebase Device Store automatically stores device and FCM information for Firebase Auth users in Cloud Firestore.

When creating a device store, it will:

1. Request appropriate Firebase Messaging permissions, if they have not already been granted
2. Subscribe to Firebase Auth and listen to changes in authentication state
3. Subscribe to Firebase Messaging and listen to changes in the FCM token
4. Automatically store device and FCM token information in the Cloud Firestore collection you specify

Data Model

A Document is created in the Cloud Firestore collection for each logged in user:

/user-devices
  - userId1: {},
  - userId2: {},

The structure of this Document is as follows:

{
  devices: Device[],
  userId: string,
}

A Device object contains the following:

{
  deviceId: string, // The browser's user agent
  fcmToken: string, // The FCM token
  name: string,     // The name of the browser
  os: string,       // The OS of the device
  type: 'web'
}

API

DeviceStore(app, collectionPath)

Parameters:

• app: firebase.app.App for the Firebase App to use
• collectionPath: (Optional) string to specify the Cloud Firestore collection where devices should be stored. Defaults to user-devices.

Returns: Promise<DeviceStore> containing:

• signOut: A method to be called before firebase.auth().signOut() to ensure that the device token is removed from the user. This can't be done automatically due to Cloud Firestore security rules.
• unsubscribe: A method that can be called to unsubscribe the device store from Auth and Messaging.

Security rules

You will need to add the following security rules for your Cloud Firestore collection:

service cloud.firestore {
  match /databases/{database}/documents {
    // Add this rule, replacing `user-devices` with the collection path you would like to use:
    match /user-devices/{userId} {
      allow create, read, update, delete: if request.auth.uid == userId;
    }
  }
}