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 2025-03-21 UTC."],[[["The webpage provides documentation for overriding authentication credentials in Google Cloud C++ client libraries, starting from version 2.11.0 up to the latest release candidate 2.37.0-rc."],["The default authentication method uses Application Default Credentials, but you can override this by using the `UnifiedCredentialsOption` and loading a service account key file."],["The example provided demonstrates how to explicitly load a service account key file using `google::cloud::MakeServiceAccountCredentials`."],["For detailed information on managing service account keys, it's recommended to consult the \"Best practices for managing service account keys\" guide."],["The \"Authentication Components\" section offers additional information on factory functions to create `google::cloud::Credentials` objects."]]],[]]
