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/*
Copyright 2014 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package rest
import (
"encoding/json"
"fmt"
"net/http"
"path"
"k8s.io/client-go/pkg/api/unversioned"
)
const (
legacyAPIPath = "/api"
defaultAPIPath = "/apis"
)
// TODO: Is this obsoleted by the discovery client?
// ServerAPIVersions returns the GroupVersions supported by the API server.
// It creates a RESTClient based on the passed in config, but it doesn't rely
// on the Version and Codec of the config, because it uses AbsPath and
// takes the raw response.
func ServerAPIVersions(c *Config) (groupVersions []string, err error) {
transport, err := TransportFor(c)
if err != nil {
return nil, err
}
client := http.Client{Transport: transport}
configCopy := *c
configCopy.GroupVersion = nil
configCopy.APIPath = ""
baseURL, _, err := defaultServerUrlFor(&configCopy)
if err != nil {
return nil, err
}
// Get the groupVersions exposed at /api
originalPath := baseURL.Path
baseURL.Path = path.Join(originalPath, legacyAPIPath)
resp, err := client.Get(baseURL.String())
if err != nil {
return nil, err
}
var v unversioned.APIVersions
defer resp.Body.Close()
err = json.NewDecoder(resp.Body).Decode(&v)
if err != nil {
return nil, fmt.Errorf("unexpected error: %v", err)
}
groupVersions = append(groupVersions, v.Versions...)
// Get the groupVersions exposed at /apis
baseURL.Path = path.Join(originalPath, defaultAPIPath)
resp2, err := client.Get(baseURL.String())
if err != nil {
return nil, err
}
var apiGroupList unversioned.APIGroupList
defer resp2.Body.Close()
err = json.NewDecoder(resp2.Body).Decode(&apiGroupList)
if err != nil {
return nil, fmt.Errorf("unexpected error: %v", err)
}
for _, g := range apiGroupList.Groups {
for _, gv := range g.Versions {
groupVersions = append(groupVersions, gv.GroupVersion)
}
}
return groupVersions, nil
}
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