firestore.rules

rules_version = '2';
service cloud.firestore {
  match /databases/{database}/documents {
    match /users/{document=**}  {
    
	    //Allow creating a new user to anyone who is authenticated
        allow create:  if isSignedIn();

		//Allow read if signed in 
		allow read: if isSignedIn();
      
  		//Allow write if isSignedIn() cannot check for uid matching here because other users can also edit to add new contact. Will add validation to it later
        allow write: if isSignedIn();

        // Allow update only if the uid matches  (same user)
        allow update: if isSignedIn() && request.auth.uid == resource.data.uid;

        // Allow delete only if the uid matches  (same user)
        allow delete: if isSignedIn() && request.auth.uid == resource.data.uid;

  }
  
  match /username_uid_map/{document=**}  {
  
      allow create, read : if isSignedIn();  //Once a uid mapping is created it cannot be deleted or updated from the app
  
  }
  
  match /chats/{document=**}  {
      //Allow users to only create and read chats. Delete and update not available right now
	  allow create,read : if isSignedIn();
  
  }
}
}

function isSignedIn() {
    return request.auth.uid != null;
}