impl Plugin for CustomAssetReaderPlugin {
    fn build(&self, app: &mut App) {
        let mut file_hashes = HashMap::new();
        file_hashes.insert("assets/branding/icon.png", "c09n2309jv");
        let file_hashes = Arc::new(file_hashes);
        app.register_asset_source(
            AssetSourceId::Default,
            AssetSource::build().with_reader(move || {
                Box::new(HttpWasmAssetReader::new("assets").with_request_mapper({
                    let file_hashes = file_hashes.clone();
                    move |path| {
                        let mapped = file_hashes.get(path).map_or_else(
                            || Cow::Borrowed(path),
                            |hash| Cow::Owned([path, "?", hash].concat()),
                        );
                        info!("Mapped asset path '{}' to '{}'", path, mapped);
                        mapped
                    }
                }))
            }),
        );
    }
}