I am currently writing a chat application online, and I want to be able to disable accounts on the go. Once I disable the account, if the user goes to send a message, currently they are able to. I would like it to only allow write data for authenticated and non-disabled users.

I currently have the code as:

rules_version = '2';

service cloud.firestore {
  match /databases/{database}/documents {
    match /{document=**} {
      allow read, write: if request.auth != null;
    }
  }
}

I have tried using the following:

rules_version = '2';

service cloud.firestore {
  match /databases/{database}/documents {
    match /{document=**} {
      allow read, write: if auth.token.email_verified == true && auth.token.email.matches(/.*@gmail.com);
    }
  }
}

and have tried this…

rules_version = '2';

service cloud.firestore {
  match /databases/{database}/documents {
    match /{document=**} {
      allow read, write: if request.auth == auth.uid;
    }
  }
}

I am unsure what I need to place inside the rules file for only authenticated and non-disabled accounts can write new messages.

So within the Firebase database, the rule file needs to be changed to allow only authenticated, and non-disabled users to allow to write data (aka: sending messages).

Thank you to everyone who has seen this messaged, and have tried to help!