support ephemeral containers (#97)

Signed-off-by: Amir Malka <amirm@armosec.io>

instanceidhandler/v1/ephemeralcontainerinstance/helpers.go

@@ -0,0 +1,63 @@
+package ephemeralcontainerinstance
+
+import (
+	"fmt"
+
+	"github.com/kubescape/k8s-interface/instanceidhandler/v1/helpers"
+	core1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+func validateInstanceID(instanceID *InstanceID) error {
+	if instanceID.GetAPIVersion() == "" {
+		return fmt.Errorf("invalid instanceID: apiVersion cannot be empty")
+	}
+	if instanceID.GetNamespace() == "" {
+		return fmt.Errorf("invalid instanceID: namespace cannot be empty")
+	}
+	if instanceID.GetKind() == "" {
+		return fmt.Errorf("invalid instanceID: kind cannot be empty")
+	}
+	if instanceID.GetName() == "" {
+		return fmt.Errorf("invalid instanceID: name cannot be empty")
+	}
+	if instanceID.GetContainerName() == "" {
+		return fmt.Errorf("invalid instanceID: containerName cannot be empty")
+	}
+	return nil
+}
+
+func listInstanceIDs(ownerReferences []metav1.OwnerReference, ephemeralContainers []core1.EphemeralContainer, apiVersion, namespace, kind, name string) ([]InstanceID, error) {
+
+	if len(ephemeralContainers) == 0 {
+		return []InstanceID{}, nil // ephemeral containers are optional
+	}
+
+	instanceIDs := make([]InstanceID, 0)
+
+	parentApiVersion, parentKind, parentName := apiVersion, kind, name
+
+	if len(ownerReferences) != 0 && !helpers.IgnoreOwnerReference(ownerReferences[0].Kind) {
+		parentApiVersion = ownerReferences[0].APIVersion
+		parentKind = ownerReferences[0].Kind
+		parentName = ownerReferences[0].Name
+	}
+
+	for i := range ephemeralContainers {
+		instanceID := &InstanceID{
+			apiVersion:             parentApiVersion,
+			namespace:              namespace,
+			kind:                   parentKind,
+			name:                   parentName,
+			ephemeralContainerName: ephemeralContainers[i].Name,
+		}
+
+		if err := validateInstanceID(instanceID); err != nil {
+			return nil, fmt.Errorf("failed to validate instance ID: %w", err)
+		}
+
+		instanceIDs = append(instanceIDs, *instanceID)
+	}
+
+	return instanceIDs, nil
+}