tailscale/tsnet/example/tshello/tshello.go

// 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
}
tsnet: add Tailscale-as-a-library package Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com> 4 years ago			`// 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`
			`}`