118 lines
3.1 KiB
Go
118 lines
3.1 KiB
Go
/*
|
|
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 util
|
|
|
|
import (
|
|
"strings"
|
|
|
|
v1 "k8s.io/api/admissionregistration/v1"
|
|
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
|
"k8s.io/apimachinery/pkg/runtime/schema"
|
|
"k8s.io/apiserver/pkg/admission"
|
|
)
|
|
|
|
// Matcher determines if the Attr matches the Rule.
|
|
type Matcher struct {
|
|
Rule v1.RuleWithOperations
|
|
Attr admission.Attributes
|
|
}
|
|
|
|
// Matches returns if the Attr matches the Rule.
|
|
func (r *Matcher) Matches() bool {
|
|
return r.scope() &&
|
|
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
|
|
}
|
|
|
|
var namespaceResource = schema.GroupVersionResource{Group: "", Version: "v1", Resource: "namespaces"}
|
|
|
|
func (r *Matcher) scope() bool {
|
|
if r.Rule.Scope == nil || *r.Rule.Scope == v1.AllScopes {
|
|
return true
|
|
}
|
|
// attr.GetNamespace() is set to the name of the namespace for requests of the namespace object itself.
|
|
switch *r.Rule.Scope {
|
|
case v1.NamespacedScope:
|
|
// first make sure that we are not requesting a namespace object (namespace objects are cluster-scoped)
|
|
return r.Attr.GetResource() != namespaceResource && r.Attr.GetNamespace() != metav1.NamespaceNone
|
|
case v1.ClusterScope:
|
|
// also return true if the request is for a namespace object (namespace objects are cluster-scoped)
|
|
return r.Attr.GetResource() == namespaceResource || r.Attr.GetNamespace() == metav1.NamespaceNone
|
|
default:
|
|
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 == v1.OperationAll {
|
|
return true
|
|
}
|
|
// The constants are the same such that this is a valid cast (and this
|
|
// is tested).
|
|
if op == v1.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
|
|
}
|