How to upgrade to firebase storage rules v2

Question

Today when I tried to update my firebase storage rules I got a message about upgrading them. How do I do that?

i  deploying storage
i  firebase.storage: checking storage.rules for compilation errors...
⚠  [W] undefined:undefined - Ruleset uses old version (version [1]). Please update to the latest version (version [2]).
✔  firebase.storage: rules file storage.rules compiled successfully
i  storage: uploading rules storage.rules...
✔  storage: released rules storage.rules to firebase.storage

My rules looks like this:

service firebase.storage {
    match /b/{bucket}/o {
        match /user-files/{uid}/{allPaths=**} {
            allow read: if resource.metadata[request.auth.uid] == "1";  // the uploading user can get a downloadURL
            allow create, update: if request.auth.uid == uid // User can only upload to the users own folder
                && request.auth.token.storageLeft >= request.resource.size
                && request.auth.token.path == request.resource.name
            allow delete: if false; // files are only deleted by cloud functions
        }
    }
}

Answer 1

To switch your rules to version 2, add this line at the top:

rules_version = "2";

To learn more about the new version of the rules language, see the documentation on getting started.