feat: add i18n support

service/singleton/i18n.go

@@ -0,0 +1,80 @@
+package singleton
+
+import (
+	"archive/zip"
+	"bytes"
+	"fmt"
+	"log"
+
+	"github.com/naiba/nezha/pkg/i18n"
+)
+
+const domain = "nezha"
+
+var Localizer *i18n.Localizer
+
+func initI18n() {
+	if err := loadTranslation(); err != nil {
+		log.Printf("NEZHA>> init i18n failed: %v", err)
+	}
+}
+
+func loadTranslation() error {
+	lang := Conf.Language
+	if lang == "" {
+		lang = "zh_CN"
+	}
+
+	data, err := getTranslationArchive(lang)
+	if err != nil {
+		return err
+	}
+
+	Localizer = i18n.NewLocalizer(lang, domain, domain+".zip", data)
+	return nil
+}
+
+func OnUpdateLang(lang string) error {
+	if Localizer.Exists(lang) {
+		Localizer.SetLanguage(lang)
+		return nil
+	}
+
+	data, err := getTranslationArchive(lang)
+	if err != nil {
+		return err
+	}
+
+	Localizer.AppendIntl(lang, domain, domain+".zip", data)
+	Localizer.SetLanguage(lang)
+	return nil
+}
+
+func getTranslationArchive(lang string) ([]byte, error) {
+	files := [...]string{
+		fmt.Sprintf("translations/%s/LC_MESSAGES/%s.po", lang, domain),
+		fmt.Sprintf("translations/%s/LC_MESSAGES/%s.mo", lang, domain),
+	}
+
+	buf := new(bytes.Buffer)
+	w := zip.NewWriter(buf)
+
+	for _, file := range files {
+		f, err := w.Create(file)
+		if err != nil {
+			return nil, err
+		}
+		data, err := i18n.Translations.ReadFile(file)
+		if err != nil {
+			return nil, err
+		}
+		if _, err := f.Write(data); err != nil {
+			return nil, err
+		}
+	}
+	if err := w.Close(); err != nil {
+		return nil, err
+	}
+
+	return buf.Bytes(), nil
+}