svcacct: default expiration of TokenRequest

* default expiration seconds to 1 hour

pkg/apis/authentication/v1/defaults.go

@@ -17,9 +17,17 @@ limitations under the License.
 package v1
 
 import (
+	authenticationv1 "k8s.io/api/authentication/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 )
 
 func addDefaultingFuncs(scheme *runtime.Scheme) error {
 	return RegisterDefaults(scheme)
 }
+
+func SetDefaults_TokenRequestSpec(obj *authenticationv1.TokenRequestSpec) {
+	if obj.ExpirationSeconds == nil {
+		hour := int64(60 * 60)
+		obj.ExpirationSeconds = &hour
+	}
+}