fix: existing clusters and secretes

Signed-off-by: Huabing Zhao <[email protected]>

internal/xds/translator/oidc.go

@@ -376,7 +376,7 @@ func createOAuth2TokenEndpointCluster(tCtx *types.ResourceVersionTable,
 		return err
 	}
 
-	return err
+	return nil
 }
 
 // createOAuth2Secrets creates OAuth2 client and HMAC secrets from the provided
@@ -392,11 +392,11 @@ func createOAuth2Secrets(tCtx *types.ResourceVersionTable, routes []*ir.HTTPRout
 		// a separate secret is created for each route, even they share the same
 		// oauth2 client ID and secret.
 		clientSecret := buildOAuth2ClientSecret(route.Security.OIDC)
-		if err := addXdsSecret(tCtx, clientSecret); err != nil {
+		if err := addXdsSecret(tCtx, clientSecret); err != nil && !errors.Is(err, ErrXdsSecretExists) {
 			errs = errors.Join(errs, err)
 		}
 
-		if err := addXdsSecret(tCtx, buildOAuth2HMACSecret(route.Security.OIDC)); err != nil {
+		if err := addXdsSecret(tCtx, buildOAuth2HMACSecret(route.Security.OIDC)); err != nil && !errors.Is(err, ErrXdsSecretExists) {
 			errs = errors.Join(errs, err)
 		}
 	}