What are some examples of Firestore security rules?

What are some examples of Firestore security rules?

Firestore security rules control access to your database. Here are a few examples:

1. Allow read access to all users:

   service cloud.firestore {
     match /databases/{database}/documents {
       match /{document=**} {
         allow read: if true;
       }
     }
   }
   

2. Allow write access only to authenticated users:

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

3. Allow users to read and write their own data:

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

Would you like more examples or explanations?

Can you explain the third example in more detail?

Sure! The third example allows users to access only their own data in the 'users' collection. Here's how it works:

• match /users/{userId}: This line specifies that the rules apply to documents in the 'users' collection, where each document ID corresponds to a user's unique ID.
• allow read, write: if request.auth.uid == userId;: This line checks if the authenticated user's ID (request.auth.uid) matches the document ID (userId). If they match, the user can read and write to that document. This ensures that users can only access their own data.

What happens if a user tries to access another user's data?

If a user tries to access another user's data, the request will be denied because the condition request.auth.uid == userId will evaluate to false. Firestore will not allow the read or write operation, ensuring that user data remains private and secure.