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This library contains helpers to create OAuth2 access tokens. This may be useful when trying to access customer services deployed to Cloud Run, or when using Google APIs that lack a client library in google-cloud-cpp.
The following shows the code that you'll run in the google/cloud/oauth2/quickstart/ directory. This is the typical usage of the library in applications.
#include "google/cloud/oauth2/access_token_generator.h"
#include <iostream>
int main(int argc, char* argv[]) try {
if (argc != 1) {
std::cerr << "Usage: " << argv[0] << "\n";
return 1;
}
// Use Application Default Credentials to initialize an AccessTokenGenerator
// retrieve the access token.
auto credentials = google::cloud::MakeGoogleDefaultCredentials();
auto generator =
google::cloud::oauth2::MakeAccessTokenGenerator(*credentials);
auto token = generator->GetToken();
if (!token) throw std::move(token).status();
// Only print the first few characters to avoid leaking tokens in test logs.
std::cout << "The access token starts with " << token->token.substr(0, 16)
<< "\n";
return 0;
} catch (google::cloud::Status const& status) {
std::cerr << "google::cloud::Status thrown: " << status << "\n";
return 1;
}
Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2025-08-14 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["This library provides tools for creating OAuth2 access tokens, which are particularly useful for accessing services on Cloud Run or Google APIs without a dedicated client library."],["The latest version of the library is 2.37.0-rc, with a range of previous versions available down to 2.16.0 for users who need to reference older versions."],["The primary functionality is centered around the `AccessTokenGenerator` interface and the `MakeAccessTokenGenerator` function, which simplifies the process of retrieving access tokens."],["The library utilizes Application Default Credentials for authentication, simplifying the setup process."],["The library provides information on error handling and authentication methods at Google, helping developers understand and manage issues and authentication workflows."]]],[]]
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