When it comes to an Electron app, similar to any other client such as web or mobile apps, the key to restricting access lies in having a robust backend system. With Firebase, for instance, you can utilize Firebase rules to specify which users or collections are allowed to read or write data.
The initial step involves setting up an authentication method, particularly utilizing the auth service provided by Firebase if that is your platform of choice.
Following that, you can establish rules that permit only authenticated users to interact with your database, whether it be for writing or reading information.
Once the user has been successfully authenticated, you have the flexibility to grant access to specific sections of the database based on their unique user ID, among other criteria.
The customization possibilities with these rules are extensive, but they serve as the fundamental building block for securing your application. For further insights, delve into the detailed documentation on implementing security rules within the Firebase realtime database available here.