1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
// Copyright (C) MongoDB, Inc. 2022-present.
//
// 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
package creds
import (
"context"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"os"
"go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
)
// GCPCredentialProvider provides GCP credentials.
type GCPCredentialProvider struct {
httpClient *http.Client
}
// NewGCPCredentialProvider generates new GCPCredentialProvider
func NewGCPCredentialProvider(httpClient *http.Client) GCPCredentialProvider {
return GCPCredentialProvider{httpClient}
}
// GetCredentialsDoc generates GCP credentials.
func (p GCPCredentialProvider) GetCredentialsDoc(ctx context.Context) (bsoncore.Document, error) {
metadataHost := "metadata.google.internal"
if envhost := os.Getenv("GCE_METADATA_HOST"); envhost != "" {
metadataHost = envhost
}
url := fmt.Sprintf("http://%s/computeMetadata/v1/instance/service-accounts/default/token", metadataHost)
req, err := http.NewRequest(http.MethodGet, url, nil)
if err != nil {
return nil, fmt.Errorf("unable to retrieve GCP credentials: %w", err)
}
req.Header.Set("Metadata-Flavor", "Google")
resp, err := p.httpClient.Do(req.WithContext(ctx))
if err != nil {
return nil, fmt.Errorf("unable to retrieve GCP credentials: %w", err)
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("unable to retrieve GCP credentials: error reading response body: %w", err)
}
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf(
"unable to retrieve GCP credentials: expected StatusCode 200, got StatusCode: %v. Response body: %s",
resp.StatusCode,
body)
}
var tokenResponse struct {
AccessToken string `json:"access_token"`
}
// Attempt to read body as JSON
err = json.Unmarshal(body, &tokenResponse)
if err != nil {
return nil, fmt.Errorf(
"unable to retrieve GCP credentials: error reading body JSON: %w (response body: %s)",
err,
body)
}
if tokenResponse.AccessToken == "" {
return nil, fmt.Errorf("unable to retrieve GCP credentials: got unexpected empty accessToken from GCP Metadata Server. Response body: %s", body)
}
builder := bsoncore.NewDocumentBuilder().AppendString("accessToken", tokenResponse.AccessToken)
return builder.Build(), nil
}
|
