/*
 * Copyright the original author or 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 kubernetes

import (
	"context"

	authorizationv1 "k8s.io/api/authorization/v1"
	k8serrors "k8s.io/apimachinery/pkg/api/errors"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"

	"github.com/citrusframework/yaks/pkg/client"
)

// CheckPermission can be used to check if the current user/service-account is allowed to execute a given operation
// in the cluster.
// E.g. checkPermission(client, olmv1alpha1.GroupName, "clusterserviceversions", namespace, "yaks", "get")
//

func CheckPermission(ctx context.Context, client client.Client, group, resource, namespace, name, verb string) (bool, error) {
	sarReview := &authorizationv1.SelfSubjectAccessReview{
		Spec: authorizationv1.SelfSubjectAccessReviewSpec{
			ResourceAttributes: &authorizationv1.ResourceAttributes{
				Group:     group,
				Resource:  resource,
				Namespace: namespace,
				Name:      name,
				Verb:      verb,
			},
		},
	}

	if sar, err := client.AuthorizationV1().SelfSubjectAccessReviews().Create(ctx, sarReview, metav1.CreateOptions{}); err == nil {
		return sar.Status.Allowed, nil
	} else if !k8serrors.IsForbidden(err) {
		return false, err
	}

	return false, nil
}
