func()

in pkg/cli/user.go [125:186]

• 52 lines of code
• 9 McCabe index (conditional complexity)

func (u *User) createCert() error {
	id := strings.TrimSuffix(u.cert, ".crt")
	var encodedCert bytes.Buffer
	certFile, err := os.Create(id + ".crt")
	if err != nil {
		return err
	}
	defer certFile.Close()

	keyFile, err := os.Create(id + ".key")
	if err != nil {
		return err
	}
	defer keyFile.Close()

	priv, err := rsa.GenerateKey(rand.Reader, 2048)
	if err != nil {
		return err
	}

	notBefore := time.Now()
	notAfter := notBefore.Add(5 * 365 * 24 * time.Hour) // 5 years

	serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
	serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
	if err != nil {
		return err
	}

	template := x509.Certificate{
		SerialNumber: serialNumber,
		Subject: pkix.Name{
			Organization: []string{"kubernetes"},
		},
		NotBefore:             notBefore,
		NotAfter:              notAfter,
		KeyUsage:              x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
		BasicConstraintsValid: true,
	}

	derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
	if err != nil {
		return err
	}

	err = pem.Encode(&encodedCert, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
	if err != nil {
		return err
	}

	_, err = certFile.Write(encodedCert.Bytes())
	if err != nil {
		return err
	}

	err = pem.Encode(keyFile, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)})
	if err != nil {
		return err
	}

	return nil
}