httpfolder.go

package main

import (
	"errors"
	"flag"
	"fmt"
	"github.com/abbot/go-http-auth"
	"log"
	"net"
	"net/http"
	"os"
)

var ipa string
var port string
var usr string
var passwd string

func main() {
	flag.StringVar(&ipa, "i", "", "ip addess to serve on")
	flag.StringVar(&port, "p", "8080", "port to listen on")
	flag.Parse()
	usr = flag.Arg(0)
	passwd = flag.Arg(1)
	cwd, err := os.Getwd()
	ip, err := localIP()
	fmt.Printf("Serving: %s at http://%s:%s\n", cwd, ip, port)
	if err != nil {
		log.Fatal(err)
	}

	authenticator := auth.NewBasicAuthenticator("Please login.", Secret)
	http.HandleFunc("/",
		authenticator.Wrap(func(res http.ResponseWriter, req *auth.AuthenticatedRequest) {
			FileServer(Dir(cwd)).ServeHTTP(res, &req.Request)
		}))
	err = http.ListenAndServe((ipa + ":" + port), nil)
	if err != nil {
		log.Fatal(err)
	}
}

func Secret(user, realm string) string {
	mymd5 := ""
	if user == usr {
		mymd5 = string(auth.MD5Crypt([]byte(passwd), []byte("mymysalt"), []byte("$apr1$")))
	}
	return mymd5
}

func localIP() (net.IP, error) {
	tt, err := net.Interfaces()
	if err != nil {
		return nil, err
	}
	fmt.Println(tt)
	for _, t := range tt {
		aa, err := t.Addrs()
		if err != nil {
			return nil, err
		}
		for _, a := range aa {
			ipnet, ok := a.(*net.IPNet)
			if !ok {
				continue
			}
			v4 := ipnet.IP.To4()
			if v4 == nil || v4[0] == 127 { // loopback address
				continue
			}
			return v4, nil
		}
	}
	return nil, errors.New("cannot find local IP address")
}