feat(i18n): add English and Simplified Chinese

internal/api/locale.go

@@ -0,0 +1,36 @@
+package api
+
+import (
+	"bytes"
+	"encoding/json"
+	"net/http"
+	"rawmark/internal/i18n"
+	"strings"
+)
+
+func localized(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if strings.HasPrefix(r.URL.Path, "/api/") {
+			w.Header().Set("Content-Language", string(i18n.Negotiate(r.Header.Get("Accept-Language"))))
+		}
+		next.ServeHTTP(w, r)
+	})
+}
+func responseLocale(w http.ResponseWriter) i18n.Locale {
+	return i18n.Negotiate(w.Header().Get("Content-Language"))
+}
+func message(w http.ResponseWriter, key string, args ...any) string {
+	return i18n.Text(responseLocale(w), key, args...)
+}
+func validateLocale(settings map[string]json.RawMessage) error {
+	if raw, ok := settings["locale"]; ok {
+		if bytes.Equal(bytes.TrimSpace(raw), []byte("null")) {
+			return nil
+		}
+		var locale string
+		if err := json.Unmarshal(raw, &locale); err != nil || (locale != "en" && locale != "zh-CN") {
+			return i18n.New("invalid_locale")
+		}
+	}
+	return nil
+}