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 2025-04-17 UTC."],[[["This page provides documentation for various 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 documentation outlines how to override the default Application Default Credentials (ADC) for authenticating with Google Cloud Services using the `UnifiedCredentialsOption`."],["Users can override default credentials by explicitly loading a service account key file, as demonstrated in the example code provided."],["The example code shows how to set the `UnifiedCredentialsOption` using the `MakeServiceAccountCredentials` function in order to load the credentials."],["For more details on creating `google::cloud::Credentials` objects and general best practices for managing service account keys, refer to the \"Authentication Components\" and the \"Best practices for managing service account keys\" documentation pages, respectively."]]],[]]
