middleware.go

func chainMiddleware(middlewares []middleware, handler func(*http.ResponseWriter, *http.Request)) {
	for _, middleware := range middlewares {
		handler = middleware(handler)
	}
	return handler
}

handler := chainMIddleware([]Middleware{
	func(handler) { return BuidParamsHandler(handler, mux.Vars)} 
	func(handler) { return BuidProtectedHandler(handler, []string{enumRoles.roles})}, 
	func(handler) { return BuidLogging(handler)},
})

type Middleware func(handler) handler