client.go

Documentation: k8s.io/client-go/openapi

     1  /*
     2  Copyright 2017 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package openapi
    18  
    19  import (
    20  	"context"
    21  	"encoding/json"
    22  	"strings"
    23  
    24  	"k8s.io/client-go/rest"
    25  	"k8s.io/kube-openapi/pkg/handler3"
    26  )
    27  
    28  type Client interface {
    29  	Paths() (map[string]GroupVersion, error)
    30  }
    31  
    32  type client struct {
    33  	// URL includes the `hash` query param to take advantage of cache busting
    34  	restClient rest.Interface
    35  }
    36  
    37  func NewClient(restClient rest.Interface) Client {
    38  	return &client{
    39  		restClient: restClient,
    40  	}
    41  }
    42  
    43  func (c *client) Paths() (map[string]GroupVersion, error) {
    44  	data, err := c.restClient.Get().
    45  		AbsPath("/openapi/v3").
    46  		Do(context.TODO()).
    47  		Raw()
    48  
    49  	if err != nil {
    50  		return nil, err
    51  	}
    52  
    53  	discoMap := &handler3.OpenAPIV3Discovery{}
    54  	err = json.Unmarshal(data, discoMap)
    55  	if err != nil {
    56  		return nil, err
    57  	}
    58  
    59  	// Create GroupVersions for each element of the result
    60  	result := map[string]GroupVersion{}
    61  	for k, v := range discoMap.Paths {
    62  		// If the server returned a URL rooted at /openapi/v3, preserve any additional client-side prefix.
    63  		// If the server returned a URL not rooted at /openapi/v3, treat it as an actual server-relative URL.
    64  		// See https://github.com/kubernetes/kubernetes/issues/117463 for details
    65  		useClientPrefix := strings.HasPrefix(v.ServerRelativeURL, "/openapi/v3")
    66  		result[k] = newGroupVersion(c, v, useClientPrefix)
    67  	}
    68  	return result, nil
    69  }
    70
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