quick implementation of middleware

middleware.go

@@ -0,0 +1,28 @@
+package tuu
+
+type Middleware func(Handler) Handler
+
+type MiddlewareStack struct {
+	stack []Middleware
+}
+
+func (m *MiddlewareStack) Use(mw ...Middleware) {
+	m.stack = append(m.stack, mw...)
+}
+
+func (m *MiddlewareStack) Get() []Middleware {
+	return m.stack
+}
+
+func (m *MiddlewareStack) handler(r *Route) Handler {
+	handler := r.Handler
+	if len(m.stack) == 0 {
+		return handler
+	}
+
+	for _, mw := range m.stack {
+		handler = mw(handler)
+	}
+
+	return handler
+}