Method unmarshalReader

viper.go:1701–1732

(in io.Reader, c map[string]any)

}

func (v *Viper) unmarshalReader(in io.Reader, c map[string]any) error {
	format := strings.ToLower(v.getConfigType())
	if format == "" {
		return errors.New("cannot decode configuration: unable to determine config type")
	}

	buf := new(bytes.Buffer)
	_, err := buf.ReadFrom(in)
	if err != nil {
		return fmt.Errorf("failed to read configuration from input: %w", err)
	}

	// TODO: remove this once SupportedExts is deprecated/removed
	if !slices.Contains(SupportedExts, format) {
		return UnsupportedConfigError(format)
	}

	// TODO: return [UnsupportedConfigError] if the registry does not contain the format
	// TODO: consider deprecating this error type
	decoder, err := v.decoderRegistry.Decoder(format)
	if err != nil {
		return ConfigParseError{err}
	}

	err = decoder.Decode(buf.Bytes(), c)
	if err != nil {
		return ConfigParseError{err}
	}

	insensitiviseMap(c)
	return nil
}

// Marshal a map into Writer.
func (v *Viper) marshalWriter(w io.Writer, configType string) error {