mirror of
https://github.com/k3s-io/k3s.git
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74 lines
2.3 KiB
Go
74 lines
2.3 KiB
Go
/*
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Copyright 2017 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 discovery
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import (
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"bytes"
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"fmt"
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"io"
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"k8s.io/apimachinery/pkg/runtime"
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)
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const APIGroupPrefix = "/apis"
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func keepUnversioned(group string) bool {
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return group == "" || group == "extensions"
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}
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// stripVersionEncoder strips APIVersion field from the encoding output. It's
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// used to keep the responses at the discovery endpoints backward compatible
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// with release-1.1, when the responses have empty APIVersion.
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type stripVersionEncoder struct {
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encoder runtime.Encoder
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serializer runtime.Serializer
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}
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func (c stripVersionEncoder) Encode(obj runtime.Object, w io.Writer) error {
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buf := bytes.NewBuffer([]byte{})
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err := c.encoder.Encode(obj, buf)
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if err != nil {
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return err
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}
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roundTrippedObj, gvk, err := c.serializer.Decode(buf.Bytes(), nil, nil)
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if err != nil {
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return err
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}
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gvk.Group = ""
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gvk.Version = ""
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roundTrippedObj.GetObjectKind().SetGroupVersionKind(*gvk)
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return c.serializer.Encode(roundTrippedObj, w)
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}
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// stripVersionNegotiatedSerializer will return stripVersionEncoder when
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// EncoderForVersion is called. See comments for stripVersionEncoder.
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type stripVersionNegotiatedSerializer struct {
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runtime.NegotiatedSerializer
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}
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func (n stripVersionNegotiatedSerializer) EncoderForVersion(encoder runtime.Encoder, gv runtime.GroupVersioner) runtime.Encoder {
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serializer, ok := encoder.(runtime.Serializer)
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if !ok {
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// The stripVersionEncoder needs both an encoder and decoder, but is called from a context that doesn't have access to the
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// decoder. We do a best effort cast here (since this code path is only for backwards compatibility) to get access to the caller's
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// decoder.
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panic(fmt.Sprintf("Unable to extract serializer from %#v", encoder))
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}
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versioned := n.NegotiatedSerializer.EncoderForVersion(encoder, gv)
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return stripVersionEncoder{versioned, serializer}
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}
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