Basic Auth middleware with example of use

main.go

package main

import (
	"fmt"
	"net/http"
)

func BasicAuth(username string, password string) func(http.Handler) http.Handler {
	return func(next http.Handler) http.Handler {
		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {

			auth := r.Header.Get("Authorization")

			if auth == "" {
				w.Header().Set("WWW-Authenticate", "Basic Realm=\"Ma App\"")
				http.Error(w, http.StatusText(401), 401)
				return
			}

			authUser, authPass, ok := r.BasicAuth()

			if !ok || authUser != username || authPass != password {
				http.Error(w, http.StatusText(403), 403)
				return
			}

			next.ServeHTTP(w, r)
		})
	}
}

func ShowIndex(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintf(w, "Welcome to secured page")
}

func main() {
	basic := BasicAuth("jernej", "sila")
	http.Handle("/", basic(http.HandlerFunc(ShowIndex)))
	http.ListenAndServe(":8080", nil)
}