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_iam_v3::
PolicyTroubleshooterClient(
google::cloud::policytroubleshooter_iam_v3::
MakePolicyTroubleshooterConnection(options));
}
Follow these links to find examples for other *Client classes:
[[["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 2025-03-21 UTC."],[[["This page details how to override default authentication credentials, specifically using `UnifiedCredentialsOption`, when interacting with Google Cloud Services."],["The example provided demonstrates how to load a service account key file to override the default authentication."],["There are links to examples for `policytroubleshooter_iam_v3::PolicyTroubleshooterClient` and `policytroubleshooter_v1::IamCheckerClient` classes that shows how to implement override authentication."],["The page also covers documentation for the various versions of `policytroubleshooter`, from version 2.11.0 to the latest 2.37.0-rc."],["The page also has a section to refer to more details about service accounts in the \"Best practices for managing service account keys\" guide and for more details on factory functions to create `google::cloud::Credentials` objects."]]],[]]
