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 2025-03-05 UTC."],[[["The latest release candidate version is 2.37.0-rc, and previous versions back to 2.11.0 are also available."],["Client libraries primarily use Application Default Credentials for Google Cloud service authentication, but you can override this default as needed."],["Overriding the default authentication can be achieved using the UnifiedCredentialsOption, as demonstrated in the provided service account key file loading example."],["For comprehensive insights into managing service account keys, refer to the \"Best practices for managing service account keys\" guide."],["For more information about creating `google::cloud::Credentials` objects you can consult the Authentication Components documentation."]]],[]]
