✨ add i18n support

common/i18n/middleware.go

@@ -0,0 +1,28 @@
+package i18n
+
+import (
+	"net/http"
+
+	"golang.org/x/text/language"
+)
+
+type I18nMiddleware struct {
+	supportTags       []language.Tag
+	localizationFiles []string
+}
+
+func NewI18nMiddleware(supportTags []language.Tag, localizationFiles []string) *I18nMiddleware {
+	return &I18nMiddleware{
+		supportTags:       supportTags,
+		localizationFiles: localizationFiles,
+	}
+}
+
+func (m *I18nMiddleware) Handle(next http.HandlerFunc) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		lang := r.Header.Get(defaultLangHeaderKey)
+		langTag := MatchCurrentLanguageTag(lang, m.supportTags)
+		bundle := NewBundle(langTag, m.localizationFiles...)
+		next(w, withRequest(r, langTag, bundle))
+	}
+}