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::assuredworkloads_v1::AssuredWorkloadsServiceClient(
google::cloud::assuredworkloads_v1::
MakeAssuredWorkloadsServiceConnection(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."],[[["This webpage provides documentation for various versions of the Assured Workloads service, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc."],["The content explains how to override the default authentication credentials used by client libraries when interacting with Google Cloud Services, which usually use [Application Default Credentials](https://cloud.google.com/docs/authentication#adc)."],["You can override default authentication by providing the [UnifiedCredentialsOption](https://cloud.google.com/cpp/docs/reference/common/latest/structgoogle_1_1cloud_1_1UnifiedCredentialsOption.html), as shown in the provided example of loading a service account key file."],["For more details on managing service account keys and creating `google::cloud::Credentials` objects, refer to the guide on [Best practices for managing service account keys](https://cloud.google.com/iam/docs/best-practices-for-managing-service-account-keys) and the [Authentication Components](https://cloud.google.com/cpp/docs/reference/common/latest/group__guac.html) documentation, respectively."]]],[]]