refactor(k8s): namespace core logic (#12142)

Co-authored-by: testA113 <aliharriss1995@gmail.com>
Co-authored-by: Anthony Lapenna <anthony.lapenna@portainer.io>
Co-authored-by: James Carppe <85850129+jamescarppe@users.noreply.github.com>
Co-authored-by: Ali <83188384+testA113@users.noreply.github.com>

api/kubernetes/cli/cluster_role_binding.go

@@ -0,0 +1,45 @@
+package cli
+
+import (
+	"context"
+	"fmt"
+
+	models "github.com/portainer/portainer/api/http/models/kubernetes"
+	rbacv1 "k8s.io/api/rbac/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+// GetClusterRoleBindings gets all the clusterRoleBindings for at the cluster level in a k8s endpoint.
+// It returns a list of K8sClusterRoleBinding objects.
+func (kcl *KubeClient) GetClusterRoleBindings() ([]models.K8sClusterRoleBinding, error) {
+	if kcl.IsKubeAdmin {
+		return kcl.fetchClusterRoleBindings()
+	}
+
+	return []models.K8sClusterRoleBinding{}, fmt.Errorf("non-admin users are not allowed to access cluster role bindings")
+}
+
+// fetchClusterRoleBindings returns a list of all cluster roles in the cluster.
+func (kcl *KubeClient) fetchClusterRoleBindings() ([]models.K8sClusterRoleBinding, error) {
+	clusterRoleBindings, err := kcl.cli.RbacV1().ClusterRoleBindings().List(context.TODO(), metav1.ListOptions{})
+	if err != nil {
+		return nil, err
+	}
+
+	results := make([]models.K8sClusterRoleBinding, 0)
+	for _, clusterRoleBinding := range clusterRoleBindings.Items {
+		results = append(results, parseClusterRoleBinding(clusterRoleBinding))
+	}
+
+	return results, nil
+}
+
+// parseClusterRoleBinding converts a rbacv1.ClusterRoleBinding object to a models.K8sClusterRoleBinding object.
+func parseClusterRoleBinding(clusterRoleBinding rbacv1.ClusterRoleBinding) models.K8sClusterRoleBinding {
+	return models.K8sClusterRoleBinding{
+		Name:         clusterRoleBinding.Name,
+		RoleRef:      clusterRoleBinding.RoleRef,
+		Subjects:     clusterRoleBinding.Subjects,
+		CreationDate: clusterRoleBinding.CreationTimestamp.Time,
+	}
+}