replace fiber with http.ServeMux

rest/handlers.go

@@ -1,5 +1,5 @@
 /*
-Copyright © 2024 Thomas von Dein
+Copyright © 2024-2025 Thomas von Dein
 
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
@@ -122,6 +122,13 @@ func RestSet(resp http.ResponseWriter, req *http.Request, conf *cfg.Config) {
 		return
 	}
 
+	// attr.Data is a string, thus the decoder doesn't expect it to be
+	// base64  encoded. However, internally we  need []byte, therefore
+	// we  copy a  cast to .Val.  We also need  to setup  the .Preview
+	// value here.
+	attr.Val = []byte(attr.Data)
+	attr.SetPreview()
+
 	err = conf.DB.Set(attr)
 	if err != nil {
 		JsonStatus(resp, http.StatusForbidden, "Unable to set key: "+err.Error())