server

package main

import (
	"crypto/tls"
	"encoding/json"
	"log/slog"
	"os"
	"path"
	"time"

	"github.com/emersion/go-smtp"
)

var (
	cfg        = Config{}
	configPath string
	v          Vault
)

func main() {
	if os.Getenv("DEBUG") != "" {
		hand := slog.NewTextHandler(
			os.Stdout,
			&slog.HandlerOptions{Level: slog.LevelDebug},
		)
		slog.SetDefault(slog.New(hand))
	}

	var err error
	configPath, err = os.UserConfigDir()
	if err != nil {
		slog.Warn(err.Error(), "details", "using ~/.config/dovel/config.json")
		configPath = "~/.config"
	}
	configPath = path.Join(configPath, "dovel")
	configFile, err := os.Open(path.Join(configPath, "config.json"))
	if err != nil {
		panic(err)
	}

	json.NewDecoder(configFile).Decode(&cfg)
	slog.Debug("config loaded", "config", cfg)

	if cfg.VaultFile != "" {
		slog.Info("loading users", "file", cfg.VaultFile)
		v, err = NewStore(cfg.VaultFile)
		if err != nil {
			slog.Warn("failed to load users", "error", err.Error())
		}
	}

	s := smtp.NewServer(backend{})
	s.Addr = ":" + cfg.Port
	s.Domain = cfg.Domain
	s.ReadTimeout = time.Duration(cfg.ReadTimeout) * time.Second
	s.WriteTimeout = time.Duration(cfg.WriteTimeout) * time.Second
	s.MaxMessageBytes = cfg.MaxMessageBytes
	s.MaxRecipients = cfg.MaxRecipients
	s.AllowInsecureAuth = cfg.AllowInsecureAuth

	if cfg.Certificate != "" {
		slog.Debug("loading certs", "cert", cfg.Certificate, "key", cfg.PrivateKey)
		c, err := tls.LoadX509KeyPair(cfg.Certificate, cfg.PrivateKey)
		if err != nil {
			panic(err)
		}
		s.TLSConfig = &tls.Config{Certificates: []tls.Certificate{c}}
	}

	err = s.ListenAndServe()
	if err != nil {
		panic(err)
	}
}