Function convertToUTF8

modules/smtp/handler.go:366–380

convertToUTF8 converts data from the given charset to UTF-8. If charset is empty, "utf-8", or "us-ascii", the data is returned as-is.

(data []byte, charset string)

// convertToUTF8 converts data from the given charset to UTF-8.
// If charset is empty, "utf-8", or "us-ascii", the data is returned as-is.
func convertToUTF8(data []byte, charset string) []byte {
	charset = strings.ToLower(strings.TrimSpace(charset))
	if charset == "" || charset == "utf-8" || charset == "us-ascii" {
		return data
	}
	enc, err := ianaindex.MIME.Encoding(charset)
	if err != nil || enc == nil {
		return data
	}
	decoded, err := enc.NewDecoder().Bytes(data)
	if err != nil {
		return data
	}
	return decoded
}