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::policytroubleshooter_v1::IamCheckerClient(
google::cloud::policytroubleshooter_v1::MakeIamCheckerConnection(
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 page lists the available versions of the Policy Troubleshooter documentation, ranging from version 2.11.0 up to the latest release candidate, 2.37.0-rc."],["The latest release candidate version is 2.37.0-rc, accessible via a direct link, while the most current stable version listed is 2.36.0."],["The default authentication method for the client libraries is Application Default Credentials, but this can be overridden by providing the UnifiedCredentialsOption."],["You can load service account credentials from a key file using `MakeServiceAccountCredentials`, as shown in the provided example code, to override default authentication."],["The documentation recommends reviewing the \"Best practices for managing service account keys\" guide for improved key management and highlights the Authentication Components section for more information on creating `google::cloud::Credentials` objects."]]],[]]