main.go

package main

import (
	"context"
	"fmt"
	"log"
	"os"
	"os/signal"
	"syscall"
	"time"

	"github.com/charmbracelet/wish"
	"github.com/charmbracelet/wish/logging"
	"github.com/gliderlabs/ssh"
)

const (
	host = "localhost"
	port = 23234
)

func main() {
	s, err := wish.NewServer(
		wish.WithAddress(fmt.Sprintf("%s:%d", host, port)),
		wish.WithHostKeyPath(".ssh/term_info_ed25519"),
		wish.WithPublicKeyAuth(func(ctx ssh.Context, key ssh.PublicKey) bool {
			return true
		}),
		wish.WithMiddleware(
			logging.Middleware(),
			func(h ssh.Handler) ssh.Handler {
				return func(s ssh.Session) {
					carlos, _, _, _, _ := ssh.ParseAuthorizedKey(
						[]byte("ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAILxWe2rXKoiO6W14LYPVfJKzRfJ1f3Jhzxrgjc/D4tU7"),
					)
					switch {
					case ssh.KeysEqual(s.PublicKey(), carlos):
						wish.Println(s, "Hey Carlos!")
					default:
						wish.Println(s, "Hey, I don't know who you are!")
					}
					h(s)
				}
			},
		),
	)
	if err != nil {
		log.Fatalln(err)
	}

	done := make(chan os.Signal, 1)
	signal.Notify(done, os.Interrupt, syscall.SIGINT, syscall.SIGTERM)
	log.Printf("Starting SSH server on %s:%d", host, port)
	go func() {
		if err = s.ListenAndServe(); err != nil {
			log.Fatalln(err)
		}
	}()

	<-done
	log.Println("Stopping SSH server")
	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
	defer func() { cancel() }()
	if err := s.Shutdown(ctx); err != nil {
		log.Fatalln(err)
	}
}