Unless otherwise configured, the client libraries use Application Default Credentials to authenticate with Google Cloud Services. While this works for most applications, in some cases you may need to override this default. You can do so by providing the UnifiedCredentialsOption The following example shows how to explicitly load a service account key file:
[](std::string const& keyfile) {
auto is = std::ifstream(keyfile);
is.exceptions(std::ios::badbit); // Minimal error handling in examples
auto contents = std::string(std::istreambuf_iterator<char>(is.rdbuf()), {});
auto options =
google::cloud::Options{}.set<google::cloud::UnifiedCredentialsOption>(
google::cloud::MakeServiceAccountCredentials(contents));
return google::cloud::cloudquotas_v1::CloudQuotasClient(
google::cloud::cloudquotas_v1::MakeCloudQuotasConnection(options));
}
[[["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 2025-03-14 UTC."],[[["The webpage provides documentation for different versions of the Cloud Quotas C++ client library, ranging from version 2.20.0 up to the latest release candidate 2.37.0-rc."],["The default authentication for the client libraries uses Application Default Credentials, but can be overridden when needed."],["Authentication can be overridden by utilizing the `UnifiedCredentialsOption`, such as loading a service account key file."],["The example on this webpage demonstrates how to override authentication by explicitly loading a service account key file."],["Best practices for managing service accounts keys can be found through a link provided on this webpage, and more information on the factory functions to create [`google::cloud::Credentials`] can also be found in the \"Authentication Components\" link."]]],[]]