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keyvault.go
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keyvault.go
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package azure
import (
"context"
"crypto/rsa"
"crypto/x509"
"encoding/base64"
"encoding/json"
"encoding/pem"
"errors"
"fmt"
"net/http"
"net/url"
"github.com/Azure/azure-sdk-for-go/sdk/azcore"
"github.com/Azure/azure-sdk-for-go/sdk/azidentity"
"github.com/Azure/azure-sdk-for-go/sdk/keyvault/azcertificates"
"github.com/Azure/azure-sdk-for-go/sdk/keyvault/azkeys"
"github.com/Azure/azure-sdk-for-go/sdk/keyvault/azsecrets"
"github.com/lestrrat-go/jwx/jwk"
)
type KeyVaultClient interface {
GetKey(
ctx context.Context, keyName string, version string,
) (jwk.Key, error)
ImportKey(ctx context.Context, keyName string, key jwk.Key) error
GetSecret(
ctx context.Context, secretName string, version string,
) (*string, error)
SetSecret(ctx context.Context, secretName string, value string) error
GetCertificate(
ctx context.Context, certificateName string, version string,
) (*x509.Certificate, error)
ImportCertificate(
ctx context.Context, certificateName string,
certificate *x509.Certificate, key *rsa.PrivateKey,
) error
}
//go:generate mockery --name KeyVaultClient --filename keyvaultclient_mock.go --with-expecter
type keyVaultClient struct {
keys *azkeys.Client
secrets *azsecrets.Client
certificates *azcertificates.Client
}
func NewKeyVaultClient(vaultUrl *url.URL) (KeyVaultClient, error) {
cred, err := azidentity.NewDefaultAzureCredential(nil)
if err != nil {
return nil, fmt.Errorf("creating credential: %v", err)
}
secrets := azsecrets.NewClient(vaultUrl.String(), cred, nil)
keys := azkeys.NewClient(vaultUrl.String(), cred, nil)
certs := azcertificates.NewClient(vaultUrl.String(), cred, nil)
return keyVaultClient{keys, secrets, certs}, nil
}
func (client keyVaultClient) GetKey(
ctx context.Context, keyName string, version string,
) (jwk.Key, error) {
resp, err := client.keys.GetKey(ctx, keyName, version, nil)
if err != nil {
var httpErr *azcore.ResponseError
if errors.As(err, &httpErr) {
if httpErr.StatusCode == http.StatusNotFound {
return nil, nil // return nil as not found
}
}
return nil, fmt.Errorf("getting key: %v", err) // return err
}
keyJwk, err := resp.Key.MarshalJSON()
if err != nil {
return nil, fmt.Errorf("converting key: %v", err)
}
parsedKey, err := jwk.ParseKey(keyJwk)
if err != nil {
return nil, fmt.Errorf("parsing key: %v", err)
}
return parsedKey, nil
}
func (client keyVaultClient) ImportKey(
ctx context.Context, keyName string, key jwk.Key,
) error {
// marshal the JWK to JSON
marshaledKey, err := json.Marshal(key)
if err != nil {
return fmt.Errorf("marshaling key: %v", err)
}
// load the JSON JWK into the azkeys JSONWebKey
toImport := azkeys.JSONWebKey{}
err = toImport.UnmarshalJSON(marshaledKey)
if err != nil {
return fmt.Errorf("loading key: %v", err)
}
// import the key
importKeyParams := azkeys.ImportKeyParameters{
Key: &toImport,
}
_, err = client.keys.ImportKey(ctx, keyName, importKeyParams, nil)
if err != nil {
return fmt.Errorf("importing key: %v", err)
}
return nil
}
func (client keyVaultClient) GetSecret(
ctx context.Context, secretName string, version string,
) (*string, error) {
resp, err := client.secrets.GetSecret(ctx, secretName, version, nil)
if err != nil {
var httpErr *azcore.ResponseError
if errors.As(err, &httpErr) {
if httpErr.StatusCode == http.StatusNotFound {
return nil, nil
}
}
return nil, fmt.Errorf("getting secret: %v", err) // return err
}
return resp.Value, nil
}
func (client keyVaultClient) SetSecret(
ctx context.Context, secretName string, value string,
) error {
setSecretParams := azsecrets.SetSecretParameters{
Value: &value,
}
_, err := client.secrets.SetSecret(ctx, secretName, setSecretParams, nil)
if err != nil {
return fmt.Errorf("setting secret: %v", err)
}
return nil
}
func (client keyVaultClient) GetCertificate(
ctx context.Context, certificateName string, version string,
) (*x509.Certificate, error) {
resp, err := client.certificates.GetCertificate(
ctx, certificateName, version, nil,
)
if err != nil {
return nil, fmt.Errorf("getting certificate: %v", err)
}
parsedCert, err := x509.ParseCertificate(resp.CER)
if err != nil {
return nil, fmt.Errorf("parsing certificate: %v", err)
}
return parsedCert, nil
}
func (client keyVaultClient) ImportCertificate(
ctx context.Context, certificateName string,
certificate *x509.Certificate, key *rsa.PrivateKey,
) error {
encodedCertAndKey, err := encodeCertAndKeyToBase64(certificate, key)
if err != nil {
return fmt.Errorf("encoding certificate and key: %v", err)
}
params := azcertificates.ImportCertificateParameters{
Base64EncodedCertificate: &encodedCertAndKey,
}
_, err = client.certificates.ImportCertificate(
ctx, certificateName, params, nil,
)
if err != nil {
return fmt.Errorf("importing certificate: %v", err)
}
return nil
}
func encodeCertAndKeyToBase64(
cert *x509.Certificate,
key *rsa.PrivateKey,
) (string, error) {
marshaledKey, err := x509.MarshalPKCS8PrivateKey(key)
if err != nil {
return "", err
}
keyBlock := pem.Block{
Type: "PRIVATE KEY",
Bytes: marshaledKey,
}
pemBytes := pem.EncodeToMemory(&keyBlock)
certBlock := pem.Block{
Type: "CERTIFICATE",
Bytes: cert.Raw,
}
pemBytes = append(pemBytes, pem.EncodeToMemory(&certBlock)...)
return base64.StdEncoding.EncodeToString(pemBytes), nil
}