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::resourcesettings_v1::ResourceSettingsServiceClient(
google::cloud::resourcesettings_v1::
MakeResourceSettingsServiceConnection(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 various versions of the Resource Settings service, ranging from version 2.11.0 up to the latest release candidate, 2.37.0-rc."],["The content demonstrates how to override default authentication credentials using `UnifiedCredentialsOption`, enabling users to explicitly load a service account key file."],["The example code provided illustrates loading credentials from a service account key file, using `MakeServiceAccountCredentials` function and `google::cloud::Options`."],["Users can refer to the \"Best practices for managing service account keys\" guide for more detailed information on how to manage their service accounts."],["The \"Authentication Components\" section offers further information on factory functions to create `google::cloud::Credentials` objects for more tailored authentication configurations."]]],[]]