将中间件与 Golang Gorilla mux 子路由器结合使用

如何将中间件应用到 Go 中大猩猩工具包 http://www.gorillatoolkit.org/多路复用器子路由器？

我有以下代码：

router := mux.NewRouter().StrictSlash(true)
apiRouter := router.PathPrefix("/api/").Subrouter()

apiRouter.Methods(http.MethodGet).
    Path("/api/path/to/handler").Handler(handleAPICall)

我想应用一个中间件处理程序来检查安全令牌，但仅限于那些以/api.

以下似乎有效：

apiRouter := mux.NewRouter()

router.PathPrefix("/api/").Handler(http.StripPrefix("/api",
    adapt(apiRouter, checkTokenHandler)))

apiRouter.Methods(http.MethodGet).
    Path("/path/to/handler").Handler(handleAPICall)
// Note that `/api` has been removed from the path.

where

func adapt(h http.Handler, adapters ...func(http.Handler) http.Handler)
    http.Handler {
    for _, adapter := range adapters {
        h = adapter(h)
    }
    return h
}

and

func checkTokenHandler(h http.Handler) http.Handler {
    return http.HandlerFunc(func(res http.ResponseWriter, req *http.Request) {
        // Check the security cookie.
        h.ServeHTTP(res, req)
    })
}