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 (
	"crypto/tls"
	"flag"
	"fmt"
	"html"
	"log"
	"net/http"
	"strings"

	"tailscale.com/client/tailscale"
	"tailscale.com/tsnet"
)

var (
	addr = flag.String("addr", ":80", "address to listen on")
)

func main() {
	flag.Parse()
	s := new(tsnet.Server)
	ln, err := s.Listen("tcp", *addr)
	if err != nil {
		log.Fatal(err)
	}
	if *addr == ":443" {
		ln = tls.NewListener(ln, &tls.Config{
			GetCertificate: tailscale.GetCertificate,
		})
	}
	log.Fatal(http.Serve(ln, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		who, err := tailscale.WhoIs(r.Context(), r.RemoteAddr)
		if err != nil {
			http.Error(w, err.Error(), 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 (`
tsnet: add TLS and LetsEncrypt example. Signed-off-by: Maisem Ali <maisem@tailscale.com> 3 years ago			`"crypto/tls"`
			`"flag"`
tsnet: add Tailscale-as-a-library package Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com> 4 years ago			`"fmt"`
			`"html"`
			`"log"`
			`"net/http"`
			`"strings"`

tsnet: run the LocalAPI handler Signed-off-by: Maisem Ali <maisem@tailscale.com> 3 years ago			`"tailscale.com/client/tailscale"`
tsnet: add Tailscale-as-a-library package Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com> 4 years ago			`"tailscale.com/tsnet"`
			`)`

tsnet: add TLS and LetsEncrypt example. Signed-off-by: Maisem Ali <maisem@tailscale.com> 3 years ago			`var (`
			`addr = flag.String("addr", ":80", "address to listen on")`
			`)`

tsnet: add Tailscale-as-a-library package Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com> 4 years ago			`func main() {`
tsnet: add TLS and LetsEncrypt example. Signed-off-by: Maisem Ali <maisem@tailscale.com> 3 years ago			`flag.Parse()`
tsnet: add Tailscale-as-a-library package Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com> 4 years ago			`s := new(tsnet.Server)`
tsnet: add TLS and LetsEncrypt example. Signed-off-by: Maisem Ali <maisem@tailscale.com> 3 years ago			`ln, err := s.Listen("tcp", *addr)`
tsnet: add Tailscale-as-a-library package Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com> 4 years ago			`if err != nil {`
			`log.Fatal(err)`
			`}`
tsnet: add TLS and LetsEncrypt example. Signed-off-by: Maisem Ali <maisem@tailscale.com> 3 years ago			`if *addr == ":443" {`
			`ln = tls.NewListener(ln, &tls.Config{`
			`GetCertificate: tailscale.GetCertificate,`
			`})`
			`}`
tsnet: add Tailscale-as-a-library package Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com> 4 years ago			`log.Fatal(http.Serve(ln, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {`
tsnet: run the LocalAPI handler Signed-off-by: Maisem Ali <maisem@tailscale.com> 3 years ago			`who, err := tailscale.WhoIs(r.Context(), r.RemoteAddr)`
			`if err != nil {`
			`http.Error(w, err.Error(), 500)`
tsnet: add Tailscale-as-a-library package Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com> 4 years ago			`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`
			`}`