What are some examples of Firebase security rules for web applications?

What are some examples of Firebase security rules for web applications?

Firebase security rules help you control access to your database. Here are a few examples:

1. Allow read access to authenticated users:

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

2. Restrict write access to specific users:

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

3. Allow only certain fields to be updated:

   service cloud.firestore {
     match /databases/{database}/documents {
       match /posts/{postId} {
         allow update: if request.resource.data.keys().hasOnly(['title', 'content']);
       }
     }
   }
   

Would you like to see more examples or explanations?

Yes, can you explain the first example in more detail?

Sure! The first example allows read access to all authenticated users. This means that any user who is logged in can read any document in your Firestore database. The rule checks if request.auth is not null, which indicates that the user is authenticated. This is a common practice to ensure that only logged-in users can access sensitive data.

What happens if a user is not authenticated?

If a user is not authenticated, they will be denied access to read any documents in the database. This helps protect your data from unauthorized access. You can customize these rules further to allow specific access based on user roles or other criteria.