gorilla_closure_middleware.go

package main

import (
  "fmt"
  "net/http"
  "github.com/gorilla/mux"
)

type httpHandlerFunc func(http.ResponseWriter, *http.Request)

func checkSecurityA(next httpHandlerFunc) httpHandlerFunc {
  return func(res http.ResponseWriter, req *http.Request) {
    header := req.Header.Get("Super-Duper-Safe-Security")
    if header != "password" {
      fmt.Fprint(res, "Invalid password")
      res.WriteHeader(http.StatusUnauthorized)
      return
    }
    next(res, req)
  }
}

func checkSecurityB(password string, next httpHandlerFunc) httpHandlerFunc {
  return func(res http.ResponseWriter, req *http.Request) {
    header := req.Header.Get("Even-Safer-Security")
    if header !=  password {
      fmt.Fprint(res, "Invalid password")
      res.WriteHeader(http.StatusUnauthorized)
      return
    }
    next(res, req)
  }
}

func indexHandler(res http.ResponseWriter, req *http.Request) {
  fmt.Fprint(res, "Hello, World!")
}

func main() {
  r := mux.NewRouter()
  r.HandleFunc("/", checkSecurityA(checkSecurityB("SaferPassword1234", (indexHandler))))
  http.Handle("/", r)
  http.ListenAndServe(":8000", nil)
}