add maintenance mode

internal/httpapp/maintenance_middleware.go

@@ -0,0 +1,39 @@
+package httpapp
+
+import (
+	"net/http"
+
+	"gitea.avt.data-center.id/othman.suseno/atlas/internal/errors"
+)
+
+// maintenanceMiddleware blocks operations during maintenance mode
+func (a *App) maintenanceMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// Skip maintenance check for read-only operations and public endpoints
+		if r.Method == http.MethodGet || r.Method == http.MethodHead || r.Method == http.MethodOptions {
+			next.ServeHTTP(w, r)
+			return
+		}
+
+		if a.isPublicEndpoint(r.URL.Path) {
+			next.ServeHTTP(w, r)
+			return
+		}
+
+		// Check if maintenance mode is enabled
+		if a.maintenanceService != nil && a.maintenanceService.IsEnabled() {
+			// Check if user is allowed during maintenance
+			user, ok := getUserFromContext(r)
+			if !ok || !a.maintenanceService.IsUserAllowed(user.ID) {
+				writeError(w, errors.NewAPIError(
+					errors.ErrCodeServiceUnavailable,
+					"system is in maintenance mode",
+					http.StatusServiceUnavailable,
+				).WithDetails("the system is currently in maintenance mode and user operations are disabled"))
+				return
+			}
+		}
+
+		next.ServeHTTP(w, r)
+	})
+}