WilliesSchematicsWorld/schematic-service-go/api/basicauth.go

package api

import (
	"crypto/md5"
	"fmt"
	"net/http"

	"github.com/willie68/schematic-service-go/dao"
)

// BasicAuth implements a simple middleware handler for adding basic http auth to a route.
func BasicAuth(realm string) func(next http.Handler) http.Handler {
	return func(next http.Handler) http.Handler {
		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			user, pass, ok := r.BasicAuth()
			hash := md5.Sum([]byte(pass))
			pass = fmt.Sprintf("md5:%x", hash)
			if !ok {
				basicAuthFailed(w, realm)
				return
			}
			fmt.Printf("user: %s, password: %s\n", user, pass)
			if !dao.CheckUser(user, pass) {
				basicAuthFailed(w, realm)
				return
			}
			next.ServeHTTP(w, r)
		})
	}
}

func basicAuthFailed(w http.ResponseWriter, realm string) {
	w.Header().Add("WWW-Authenticate", fmt.Sprintf(`Basic realm="%s"`, realm))
	w.WriteHeader(http.StatusUnauthorized)
}