Securing it All Together

QUESTION:

We wouldn’t want a user to upload a giant photo that fills up our entire space quota in Firebase Storage. Let’s add a storage security rule in the Firebase console that validates what images a user is allowed to upload in the app.

Use the examples we explored and the Firebase Storage Security documentation to design a rule that allows data to be written to storage if it is less than 3 MB.

service firebase.storage {
  match /b/&lt;firebase-bucket&gt; /o {
    match /{imageId} {
         [WHAT RULE WOULD GO HERE?]
    }
  }
}

ANSWER:

Here is an example rule that allows you to write to storage if the data is less than 3 MB.

service firebase.storage {
  match /b/<firebase-bucket> /o {
    match /{imageId} {
        allow write: if request.resource.size < 3 * 1024 * 1024
    }
  }
}

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