// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// The tshello server demonstrates how to use Tailscale as a library.
package main
import (
"fmt"
"html"
"log"
"net/http"
"strings"
"tailscale.com/tsnet"
)
func main() {
s := new(tsnet.Server)
ln, err := s.Listen("tcp", ":80")
if err != nil {
log.Fatal(err)
}
log.Fatal(http.Serve(ln, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
who, ok := s.WhoIs(r.RemoteAddr)
if !ok {
http.Error(w, "WhoIs failed", 500)
return
}
fmt.Fprintf(w, "<html><body><h1>Hello, world!</h1>\n")
fmt.Fprintf(w, "<p>You are <b>%s</b> from <b>%s</b> (%s)</p>",
html.EscapeString(who.UserProfile.LoginName),
html.EscapeString(firstLabel(who.Node.ComputedName)),
r.RemoteAddr)
})))
}
func firstLabel(s string) string {
if i := strings.Index(s, "."); i != -1 {
return s[:i]
}
return s
}