// ExactWithDateUnmarshal is intended to unmarshal a config file into a structure
// producing error when extraneous variables are introduced and supporting
// the time.Duration type
func ExactWithDateUnmarshal(v *viper.Viper, output interface{}) error {
baseKeys := v.AllSettings() // AllKeys doesn't actually return all keys, it only returns the base ones
leafKeys := getKeysRecursively("", v, baseKeys)
logger.Infof("%+v", leafKeys)
config := &mapstructure.DecoderConfig{
ErrorUnused: true,
Metadata: nil,
Result: output,
WeaklyTypedInput: true,
DecodeHook: customDecodeHook(),
}
decoder, err := mapstructure.NewDecoder(config)
if err != nil {
return err
}
return decoder.Decode(leafKeys)
}