chore: import clean Agent Desk snapshot (2/7)

internal/pkg/i18nx/middleware.go

@@ -0,0 +1,55 @@
+package i18nx
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+)
+
+const (
+	LocaleZhCN = "zh-CN"
+	LocaleEnUS = "en-US"
+	LocaleRuRU = "ru-RU"
+)
+
+var supportedLocales = map[string]string{
+	"zh":      LocaleZhCN,
+	"zh-cn":   LocaleZhCN,
+	"zh_cn":   LocaleZhCN,
+	"zh-hans": LocaleZhCN,
+	"en":      LocaleEnUS,
+	"en-us":   LocaleEnUS,
+	"en_us":   LocaleEnUS,
+	"ru":      LocaleRuRU,
+	"ru-ru":   LocaleRuRU,
+	"ru_ru":   LocaleRuRU,
+}
+
+var DefaultLocale = LocaleEnUS
+
+func SetDefaultLocale(locale string) {
+	DefaultLocale = NormalizeLocale(locale)
+}
+
+func NormalizeLocale(value string) string {
+	key := strings.ToLower(strings.TrimSpace(value))
+	if key == "" {
+		return DefaultLocale
+	}
+	if locale, ok := supportedLocales[key]; ok {
+		return locale
+	}
+	return DefaultLocale
+}
+
+func ResolveRequestLocale(_ *http.Request) string {
+	return DefaultLocale
+}
+
+func Middleware() gin.HandlerFunc {
+	return func(ctx *gin.Context) {
+		SetLocale(ctx, ResolveRequestLocale(ctx.Request))
+		ctx.Next()
+	}
+}