create cert, key

internal/selfhosted/certificate/create.go

@@ -0,0 +1,75 @@
+package certificate
+
+import (
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/x509"
+	"crypto/x509/pkix"
+	"encoding/base64"
+	"encoding/pem"
+	"math/big"
+	"time"
+
+	"k8s.io/apimachinery/pkg/types"
+)
+
+type TlsCredentials struct {
+	privateKey  []byte
+	certificate []byte
+}
+
+func (t *TlsCredentials) CaBundle() string {
+	return base64.StdEncoding.EncodeToString(t.certificate)
+}
+
+func (t *TlsCredentials) Certificate() []byte {
+	return t.certificate
+}
+
+func (t *TlsCredentials) PrivateKey() []byte {
+	return t.privateKey
+}
+
+func CreateTlsCredential(serviceNamespacedName types.NamespacedName) (TlsCredentials, error) {
+	certificatePeriod := 365 // days
+
+	// Generate RSA private key
+	privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
+	if err != nil {
+		return TlsCredentials{}, err
+	}
+
+	// Define certificate template
+	template := x509.Certificate{
+		SerialNumber: big.NewInt(1),
+		Subject: pkix.Name{
+			CommonName: serviceNamespacedName.Name + "." + serviceNamespacedName.Namespace + ".svc",
+		},
+		NotBefore:             time.Now(),
+		NotAfter:              time.Now().AddDate(0, 0, certificatePeriod),
+		KeyUsage:              x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
+		ExtKeyUsage:           []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
+		BasicConstraintsValid: true,
+		IsCA:                  true,
+	}
+
+	// Create the certificate
+	certBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &privateKey.PublicKey, privateKey)
+	if err != nil {
+		return TlsCredentials{}, err
+	}
+
+	// Encode the private key to PEM format
+	privPemBytes := pem.EncodeToMemory(&pem.Block{
+		Type:  "RSA PRIVATE KEY",
+		Bytes: x509.MarshalPKCS1PrivateKey(privateKey),
+	})
+
+	// Encode the certificate to PEM format
+	certPemBytes := pem.EncodeToMemory(&pem.Block{
+		Type:  "CERTIFICATE",
+		Bytes: certBytes,
+	})
+
+	return TlsCredentials{privateKey: privPemBytes, certificate: certPemBytes}, nil
+}