decode and save PNG to file

decoder.go

// decode the content and save to storage path location
func decodeAndSave(content, storagePath string, w http.ResponseWriter) {

   // decode the payload content
	data, err := base64.StdEncoding.DecodeString(string(content))
	if err != nil {
		fmt.Fprintf(w, "An error happened while decoding base64")
		fmt.Println(err)
		return
	}

   // store to stoage path
	err = ioutil.WriteFile(storagePath, data, 0644)
	if err != nil {
		fmt.Fprintf(w, "An error happened while writing file")
		fmt.Println(err)
		return
	}

}