main.go

Documentation: k8s.io/kubernetes/test/e2e_node/plugins/gcp-credential-provider

     1  /*
     2  Copyright 2022 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 main
    18  
    19  import (
    20  	"encoding/json"
    21  	"errors"
    22  	"io"
    23  	"net/http"
    24  	"os"
    25  	"time"
    26  
    27  	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    28  	"k8s.io/klog/v2"
    29  	credentialproviderv1 "k8s.io/kubelet/pkg/apis/credentialprovider/v1"
    30  )
    31  
    32  const metadataTokenEndpoint = "http://metadata.google.internal./computeMetadata/v1/instance/service-accounts/default/token"
    33  
    34  func main() {
    35  	if err := getCredentials(metadataTokenEndpoint, os.Stdin, os.Stdout); err != nil {
    36  		klog.Fatalf("failed to get credentials: %v", err)
    37  	}
    38  }
    39  
    40  func getCredentials(tokenEndpoint string, r io.Reader, w io.Writer) error {
    41  	provider := &provider{
    42  		client: &http.Client{
    43  			Timeout: 10 * time.Second,
    44  		},
    45  		tokenEndpoint: tokenEndpoint,
    46  	}
    47  
    48  	data, err := io.ReadAll(r)
    49  	if err != nil {
    50  		return err
    51  	}
    52  
    53  	var authRequest credentialproviderv1.CredentialProviderRequest
    54  	err = json.Unmarshal(data, &authRequest)
    55  	if err != nil {
    56  		return err
    57  	}
    58  
    59  	auth, err := provider.Provide(authRequest.Image)
    60  	if err != nil {
    61  		return err
    62  	}
    63  
    64  	response := &credentialproviderv1.CredentialProviderResponse{
    65  		TypeMeta: metav1.TypeMeta{
    66  			Kind:       "CredentialProviderResponse",
    67  			APIVersion: "credentialprovider.kubelet.k8s.io/v1",
    68  		},
    69  		CacheKeyType: credentialproviderv1.RegistryPluginCacheKeyType,
    70  		Auth:         auth,
    71  	}
    72  
    73  	if err := json.NewEncoder(w).Encode(response); err != nil {
    74  		// The error from json.Marshal is intentionally not included so as to not leak credentials into the logs
    75  		return errors.New("error marshaling response")
    76  	}
    77  
    78  	return nil
    79  }
    80
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