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Set up basic security rules

You initially set up Cloud Firestore to use test mode, meaning that your database is open for reads and writes. However, you should only use test mode during very early stages of development. As a best practice, you should set up security rules for your database as you develop your app. Security should be integral to your app's structure and behavior.
Security Rules allow you to control access to documents and collections in your database. The flexible rules syntax allows you to create rules that match anything from all writes to the entire database to operations on a specific document.
You can write security rules for Cloud Firestore in the Firebase console:
  1. 1.
    In the Firebase console's Develop section, click Database, and then select the Rules tab (or click here to go directly to the Rules tab).
  2. 2.
    You should see the following default security rules, along with a warning about the rules being public.

Identify collections

First, identify the collections to which the app writes data.
In match /databases/{database}/documents, identify the collection that you want to secure:
rules_version = '2';
service cloud.firestore {
match /databases/{database}/documents {
match /guestbook/{entry} {
// You'll add rules here in the next step.
}
}

Add security rules

Because you used the Authentication UID as a field in each guestbook document, you can get the Authentication UID and verify that anyone attempting to write to the document has a matching Authentication UID.
Add the read and write rules to your rule set as shown below:
rules_version = '2';
service cloud.firestore {
match /databases/{database}/documents {
match /guestbook/{entry} {
allow read: if request.auth.uid != null;
allow write:
if request.auth.uid == request.resource.data.userId;
}
}
}
Now, for the guestbook, only signed-in users can read messages (any message!), but only a message's author can edit a message.

Add validation rules

Add data validation to make sure that all of the expected fields are present in the document:
rules_version = '2';
service cloud.firestore {
match /databases/{database}/documents {
match /guestbook/{entry} {
allow read: if request.auth.uid != null;
allow write:
if request.auth.uid == request.resource.data.userId
&& "name" in request.resource.data
&& "text" in request.resource.data
&& "timestamp" in request.resource.data;
}
}
}
Good to know: your product docs aren't just a reference of all your features! use them to encourage folks to perform certain actions and discover the value in your product.
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Outline
Set up basic security rules
Identify collections
Add security rules
Add validation rules