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gcpcreds.go
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gcpcreds.go
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// 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/internal"
)
// GcpCredentialProvider provides GCP credentials.
type GcpCredentialProvider struct {
HTTPClient *http.Client
}
// GetCredentials generates GCP credentials.
func (p *GcpCredentialProvider) GetCredentials(ctx context.Context) (string, 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 "", internal.WrapErrorf(err, "unable to retrieve GCP credentials")
}
req.Header.Set("Metadata-Flavor", "Google")
resp, err := p.HTTPClient.Do(req.WithContext(ctx))
if err != nil {
return "", internal.WrapErrorf(err, "unable to retrieve GCP credentials")
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", internal.WrapErrorf(err, "unable to retrieve GCP credentials: error reading response body")
}
if resp.StatusCode != http.StatusOK {
return "", internal.WrapErrorf(err, "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 "", internal.WrapErrorf(err, "unable to retrieve GCP credentials: error reading body JSON. Response body: %s", body)
}
if tokenResponse.AccessToken == "" {
return "", fmt.Errorf("unable to retrieve GCP credentials: got unexpected empty accessToken from GCP Metadata Server. Response body: %s", body)
}
return tokenResponse.AccessToken, nil
}