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cluster_role_binding.go
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cluster_role_binding.go
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// Copyright Project Contour Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package clusterrolebinding
import (
"context"
"fmt"
core_v1 "k8s.io/api/core/v1"
rbac_v1 "k8s.io/api/rbac/v1"
meta_v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"sigs.k8s.io/controller-runtime/pkg/client"
"github.com/projectcontour/contour/internal/provisioner/equality"
"github.com/projectcontour/contour/internal/provisioner/labels"
"github.com/projectcontour/contour/internal/provisioner/model"
"github.com/projectcontour/contour/internal/provisioner/objects"
)
// EnsureClusterRoleBinding ensures a ClusterRoleBinding resource with the provided
// name exists, using roleRef for the role reference, svcAct for the subject and
// the contour namespace/name for the owning contour labels.
func EnsureClusterRoleBinding(ctx context.Context, cli client.Client, name, roleRef, svcAct string, contour *model.Contour) error {
desired := desiredClusterRoleBinding(name, roleRef, svcAct, contour)
// Enclose contour.
updater := func(ctx context.Context, cli client.Client, current, desired *rbac_v1.ClusterRoleBinding) error {
return updateClusterRoleBindingIfNeeded(ctx, cli, contour, current, desired)
}
return objects.EnsureObject(ctx, cli, desired, updater, &rbac_v1.ClusterRoleBinding{})
}
// desiredClusterRoleBinding constructs an instance of the desired ClusterRoleBinding
// resource with the provided name, contour namespace/name for the owning contour
// labels, roleRef for the role reference, and svcAcctRef for the subject.
func desiredClusterRoleBinding(name, roleRef, svcAcctRef string, contour *model.Contour) *rbac_v1.ClusterRoleBinding {
crb := &rbac_v1.ClusterRoleBinding{
TypeMeta: meta_v1.TypeMeta{
Kind: "RoleBinding",
},
ObjectMeta: meta_v1.ObjectMeta{
Name: name,
Labels: contour.CommonLabels(),
Annotations: contour.CommonAnnotations(),
},
}
crb.Subjects = []rbac_v1.Subject{
{
Kind: "ServiceAccount",
APIGroup: core_v1.GroupName,
Name: svcAcctRef,
Namespace: contour.Namespace,
},
}
crb.RoleRef = rbac_v1.RoleRef{
APIGroup: rbac_v1.GroupName,
Kind: "ClusterRole",
Name: roleRef,
}
return crb
}
// updateClusterRoleBindingIfNeeded updates a ClusterRoleBinding resource if current
// does not match desired, using contour to verify the existence of owner labels.
func updateClusterRoleBindingIfNeeded(ctx context.Context, cli client.Client, contour *model.Contour, current, desired *rbac_v1.ClusterRoleBinding) error {
if labels.AnyExist(current, model.OwnerLabels(contour)) {
crb, updated := equality.ClusterRoleBindingConfigChanged(current, desired)
if updated {
if err := cli.Update(ctx, crb); err != nil {
return fmt.Errorf("failed to update cluster role binding %s: %w", crb.Name, err)
}
return nil
}
}
return nil
}