71 lines
2.2 KiB
Go
71 lines
2.2 KiB
Go
/*
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Copyright 2024.
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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 auth
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import (
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"fmt"
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"net/http"
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"strings"
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"k8s.io/apiserver/pkg/authentication/authenticator"
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"k8s.io/apiserver/pkg/authentication/request/headerrequest"
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"k8s.io/apiserver/pkg/authentication/user"
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)
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// NewRequestAuthenticator returns a new request authenticator based on the provided configuration.
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func NewRequestAuthenticator(useridHeader string, useridPrefix string, groupsHeader string) (authenticator.Request, error) {
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// create an upstream `requestHeaderAuthRequestHandler` to extract user and groups from the request headers
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requestHeaderAuthenticator, err := headerrequest.New(
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[]string{useridHeader},
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[]string{groupsHeader},
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nil,
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)
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if err != nil {
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return nil, fmt.Errorf("failed to create request header authenticator: %w", err)
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}
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// if the user id prefix is empty, return the upstream authenticator as is
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if useridPrefix == "" {
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return requestHeaderAuthenticator, nil
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}
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// wrap the upstream authenticator to trim the user prefix from the user id
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requestAuthenticator := authenticator.RequestFunc(func(req *http.Request) (*authenticator.Response, bool, error) {
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response, ok, err := requestHeaderAuthenticator.AuthenticateRequest(req)
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if err != nil {
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return nil, false, err
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}
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// if the request was not authenticated, return the response as is
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if !ok {
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return response, ok, nil
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}
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// trim the user id prefix from the username
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return &authenticator.Response{
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User: &user.DefaultInfo{
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Name: strings.TrimPrefix(response.User.GetName(), useridPrefix),
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Groups: response.User.GetGroups(),
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Extra: response.User.GetExtra(),
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},
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}, true, nil
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})
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return requestAuthenticator, nil
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}
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