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::servicemanagement_v1::ServiceManagerClient(
google::cloud::servicemanagement_v1::MakeServiceManagerConnection(
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 `servicemanagement-override-authentication` feature, ranging from version 2.11.0 up to the latest release candidate, 2.37.0-rc."],["The default authentication method for client libraries involves using Application Default Credentials, but users can override this behavior."],["To override the default credentials, the documentation explains how to explicitly load a service account key file using `UnifiedCredentialsOption` and `MakeServiceAccountCredentials`."],["The provided code example demonstrates the minimum required approach to loading the service account key file content for service authentication."],["The page also contains links to the authentication components page that provide further information on how to use `google::cloud::Credentials` objects."]]],[]]
