1/*
2Copyright 2018 The Kubernetes Authors.
3
4Licensed under the Apache License, Version 2.0 (the "License");
5you may not use this file except in compliance with the License.
6You may obtain a copy of the License at
7
8    http://www.apache.org/licenses/LICENSE-2.0
9
10Unless required by applicable law or agreed to in writing, software
11distributed under the License is distributed on an "AS IS" BASIS,
12WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13See the License for the specific language governing permissions and
14limitations under the License.
15*/
16
17package policy
18
19import (
20	"fmt"
21
22	"k8s.io/apiserver/pkg/apis/audit"
23)
24
25// EnforcePolicy drops any part of the event that doesn't conform to a policy level
26// or omitStages and sets the event level accordingly
27func EnforcePolicy(event *audit.Event, level audit.Level, omitStages []audit.Stage) (*audit.Event, error) {
28	for _, stage := range omitStages {
29		if event.Stage == stage {
30			return nil, nil
31		}
32	}
33	return enforceLevel(event, level)
34}
35
36func enforceLevel(event *audit.Event, level audit.Level) (*audit.Event, error) {
37	switch level {
38	case audit.LevelMetadata:
39		event.Level = audit.LevelMetadata
40		event.ResponseObject = nil
41		event.RequestObject = nil
42	case audit.LevelRequest:
43		event.Level = audit.LevelRequest
44		event.ResponseObject = nil
45	case audit.LevelRequestResponse:
46		event.Level = audit.LevelRequestResponse
47	case audit.LevelNone:
48		return nil, nil
49	default:
50		return nil, fmt.Errorf("level unknown: %s", level)
51	}
52	return event, nil
53}
54