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::networkconnectivity_v1::HubServiceClient(
google::cloud::networkconnectivity_v1::MakeHubServiceConnection(
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 2025-05-07 UTC."],[[["The webpage provides documentation for various versions of the `networkconnectivity` C++ library, ranging from version 2.11.0 up to the latest release candidate, 2.37.0-rc."],["The content details how to override the default Application Default Credentials (ADC) for authenticating with Google Cloud services, using the `UnifiedCredentialsOption`."],["The provided code example demonstrates how to load a service account key file to explicitly override authentication settings."],["The documentation recommends consulting the \"Best practices for managing service account keys\" guide for more information on security."],["The 'Authentication Components' section is available for users to learn more about the functions required to create `google::cloud::Credentials` objects."]]],[]]
