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strings.Cut allows us to be more precise here. This example was written before strings.Cut existed. Signed-off-by: Xe <xe@tailscale.com> Signed-off-by: Xe <xe@tailscale.com>
63 lines
1.3 KiB
Go
63 lines
1.3 KiB
Go
// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// The tshello server demonstrates how to use Tailscale as a library.
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package main
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import (
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"crypto/tls"
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"flag"
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"fmt"
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"html"
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"log"
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"net/http"
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"strings"
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"tailscale.com/client/tailscale"
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"tailscale.com/tsnet"
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)
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var (
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addr = flag.String("addr", ":80", "address to listen on")
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)
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func main() {
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flag.Parse()
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s := new(tsnet.Server)
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defer s.Close()
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ln, err := s.Listen("tcp", *addr)
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if err != nil {
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log.Fatal(err)
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}
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defer ln.Close()
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lc, err := s.LocalClient()
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if err != nil {
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log.Fatal(err)
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}
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if *addr == ":443" {
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ln = tls.NewListener(ln, &tls.Config{
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GetCertificate: tailscale.GetCertificate,
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})
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}
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log.Fatal(http.Serve(ln, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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who, err := lc.WhoIs(r.Context(), r.RemoteAddr)
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if err != nil {
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http.Error(w, err.Error(), 500)
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return
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}
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fmt.Fprintf(w, "<html><body><h1>Hello, world!</h1>\n")
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fmt.Fprintf(w, "<p>You are <b>%s</b> from <b>%s</b> (%s)</p>",
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html.EscapeString(who.UserProfile.LoginName),
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html.EscapeString(firstLabel(who.Node.ComputedName)),
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r.RemoteAddr)
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})))
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}
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func firstLabel(s string) string {
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s, _, _ = strings.Cut(s, ".")
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return s
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}
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