Function CreateMockSMTPServer

coderd/notifications/dispatch/smtptest/server.go:183–214

nolint:revive // Yes, useTLS is a control flag.

(be *Backend, useTLS bool)

// nolint:revive // Yes, useTLS is a control flag.
func CreateMockSMTPServer(be *Backend, useTLS bool) (*smtp.Server, net.Listener, error) {
	// nolint:gosec
	tlsCfg := &tls.Config{
		GetCertificate: readCert,
	}

	l, err := net.Listen("tcp", "localhost:0")
	if err != nil {
		return nil, nil, xerrors.Errorf("connect: tls? %v: %w", useTLS, err)
	}

	if useTLS {
		l = tls.NewListener(l, tlsCfg)
	}

	addr, ok := l.Addr().(*net.TCPAddr)
	if !ok {
		return nil, nil, xerrors.Errorf("unexpected address type: %T", l.Addr())
	}

	s := smtp.NewServer(be)

	s.Addr = addr.String()
	s.WriteTimeout = 10 * time.Second
	s.ReadTimeout = 10 * time.Second
	s.MaxMessageBytes = 1024 * 1024
	s.MaxRecipients = 50
	s.AllowInsecureAuth = !useTLS
	s.TLSConfig = tlsCfg

	return s, l, nil
}

func readCert(_ *tls.ClientHelloInfo) (*tls.Certificate, error) {
	crt, err := tls.X509KeyPair(certFile, keyFile)