| /* |
| Copyright 2017 The Kubernetes 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 rules |
| |
| import ( |
| "strings" |
| |
| "k8s.io/api/admissionregistration/v1beta1" |
| "k8s.io/apiserver/pkg/admission" |
| ) |
| |
| // Matcher determines if the Attr matches the Rule. |
| type Matcher struct { |
| Rule v1beta1.RuleWithOperations |
| Attr admission.Attributes |
| } |
| |
| // Matches returns if the Attr matches the Rule. |
| func (r *Matcher) Matches() bool { |
| return r.operation() && |
| r.group() && |
| r.version() && |
| r.resource() |
| } |
| |
| func exactOrWildcard(items []string, requested string) bool { |
| for _, item := range items { |
| if item == "*" { |
| return true |
| } |
| if item == requested { |
| return true |
| } |
| } |
| |
| return false |
| } |
| |
| func (r *Matcher) group() bool { |
| return exactOrWildcard(r.Rule.APIGroups, r.Attr.GetResource().Group) |
| } |
| |
| func (r *Matcher) version() bool { |
| return exactOrWildcard(r.Rule.APIVersions, r.Attr.GetResource().Version) |
| } |
| |
| func (r *Matcher) operation() bool { |
| attrOp := r.Attr.GetOperation() |
| for _, op := range r.Rule.Operations { |
| if op == v1beta1.OperationAll { |
| return true |
| } |
| // The constants are the same such that this is a valid cast (and this |
| // is tested). |
| if op == v1beta1.OperationType(attrOp) { |
| return true |
| } |
| } |
| return false |
| } |
| |
| func splitResource(resSub string) (res, sub string) { |
| parts := strings.SplitN(resSub, "/", 2) |
| if len(parts) == 2 { |
| return parts[0], parts[1] |
| } |
| return parts[0], "" |
| } |
| |
| func (r *Matcher) resource() bool { |
| opRes, opSub := r.Attr.GetResource().Resource, r.Attr.GetSubresource() |
| for _, res := range r.Rule.Resources { |
| res, sub := splitResource(res) |
| resMatch := res == "*" || res == opRes |
| subMatch := sub == "*" || sub == opSub |
| if resMatch && subMatch { |
| return true |
| } |
| } |
| return false |
| } |
| |
| // IsWebhookConfigurationResource determines if an admission.Attributes object is describing |
| // the admission of a ValidatingWebhookConfiguration or a MutatingWebhookConfiguration |
| func IsWebhookConfigurationResource(attr admission.Attributes) bool { |
| gvk := attr.GetKind() |
| if gvk.Group == "admissionregistration.k8s.io" { |
| if gvk.Kind == "ValidatingWebhookConfiguration" || gvk.Kind == "MutatingWebhookConfiguration" { |
| return true |
| } |
| } |
| return false |
| } |