mirror of
https://github.com/ceph/ceph-csi.git
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77 lines
2.7 KiB
Go
77 lines
2.7 KiB
Go
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/*
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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 admission
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import (
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"fmt"
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"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/serializer"
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"k8s.io/apimachinery/pkg/util/json"
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)
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// Decoder knows how to decode the contents of an admission
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// request into a concrete object.
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type Decoder struct {
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codecs serializer.CodecFactory
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}
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// NewDecoder creates a Decoder given the runtime.Scheme
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func NewDecoder(scheme *runtime.Scheme) (*Decoder, error) {
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return &Decoder{codecs: serializer.NewCodecFactory(scheme)}, nil
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}
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// Decode decodes the inlined object in the AdmissionRequest into the passed-in runtime.Object.
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// If you want decode the OldObject in the AdmissionRequest, use DecodeRaw.
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// It errors out if req.Object.Raw is empty i.e. containing 0 raw bytes.
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func (d *Decoder) Decode(req Request, into runtime.Object) error {
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// we error out if rawObj is an empty object.
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if len(req.Object.Raw) == 0 {
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return fmt.Errorf("there is no content to decode")
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}
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return d.DecodeRaw(req.Object, into)
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}
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// DecodeRaw decodes a RawExtension object into the passed-in runtime.Object.
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// It errors out if rawObj is empty i.e. containing 0 raw bytes.
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func (d *Decoder) DecodeRaw(rawObj runtime.RawExtension, into runtime.Object) error {
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// NB(directxman12): there's a bug/weird interaction between decoders and
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// the API server where the API server doesn't send a GVK on the embedded
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// objects, which means the unstructured decoder refuses to decode. It
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// also means we can't pass the unstructured directly in, since it'll try
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// and call unstructured's special Unmarshal implementation, which calls
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// back into that same decoder :-/
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// See kubernetes/kubernetes#74373.
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// we error out if rawObj is an empty object.
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if len(rawObj.Raw) == 0 {
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return fmt.Errorf("there is no content to decode")
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}
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if unstructuredInto, isUnstructured := into.(*unstructured.Unstructured); isUnstructured {
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// unmarshal into unstructured's underlying object to avoid calling the decoder
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if err := json.Unmarshal(rawObj.Raw, &unstructuredInto.Object); err != nil {
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return err
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}
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return nil
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}
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deserializer := d.codecs.UniversalDeserializer()
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return runtime.DecodeInto(deserializer, rawObj.Raw, into)
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}
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