mirror of https://github.com/k3s-io/k3s
68 lines
1.8 KiB
Go
68 lines
1.8 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package path
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import (
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"fmt"
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"strings"
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"k8s.io/apimachinery/pkg/util/sets"
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"k8s.io/apiserver/pkg/authorization/authorizer"
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)
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// NewAuthorizer returns an authorizer which accepts a given set of paths.
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// Each path is either a fully matching path or it ends in * in case a prefix match is done. A leading / is optional.
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func NewAuthorizer(alwaysAllowPaths []string) (authorizer.Authorizer, error) {
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var prefixes []string
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paths := sets.NewString()
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for _, p := range alwaysAllowPaths {
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p = strings.TrimPrefix(p, "/")
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if len(p) == 0 {
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// matches "/"
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paths.Insert(p)
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continue
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}
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if strings.ContainsRune(p[:len(p)-1], '*') {
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return nil, fmt.Errorf("only trailing * allowed in %q", p)
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}
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if strings.HasSuffix(p, "*") {
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prefixes = append(prefixes, p[:len(p)-1])
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} else {
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paths.Insert(p)
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}
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}
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return authorizer.AuthorizerFunc(func(a authorizer.Attributes) (authorizer.Decision, string, error) {
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if a.IsResourceRequest() {
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return authorizer.DecisionNoOpinion, "", nil
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}
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pth := strings.TrimPrefix(a.GetPath(), "/")
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if paths.Has(pth) {
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return authorizer.DecisionAllow, "", nil
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}
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for _, prefix := range prefixes {
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if strings.HasPrefix(pth, prefix) {
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return authorizer.DecisionAllow, "", nil
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}
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}
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return authorizer.DecisionNoOpinion, "", nil
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}), nil
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}
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