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 provides documentation for the Policy Troubleshooter, specifically focusing on how to override authentication credentials, with a range of versions available from 2.11.0 to 2.37.0-rc (latest)."],["The latest release candidate version for the Policy Troubleshooter is 2.37.0-rc, and each version links to its own dedicated page with the same documentation title."],["By default, client libraries utilize Application Default Credentials for Google Cloud Service authentication, but you can override this by providing the UnifiedCredentialsOption."],["An example is provided demonstrating how to load a service account key file explicitly to override the default authentication method."],["The documentation references additional resources for authentication management, including the \"Best practices for managing service account keys\" guide and the \"Authentication Components\" documentation."]]],[]]