func createAndSaveSignature(writer http.ResponseWriter, req util.SignatureRequest, generator generators.BaseGenerator) error {
// Create the signature image
sig, err := generator.CreateSignature(req.Req)
if err != nil {
return err
}
// note: queue saving if it causes performance issues?
// Save the image to disk with the given hash as the file name
saveImage(req.Hash, sig.Image)
return nil
}
