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));
}
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 2025-03-05 UTC."],[[["This page provides documentation for various versions of the networkconnectivity C++ client library, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc."],["The client libraries primarily use Application Default Credentials for authentication with Google Cloud Services, but can be overridden."],["Authentication can be overridden by utilizing the `UnifiedCredentialsOption`, such as loading a service account key file as shown in the provided code example."],["Examples of overriding authentication credentials are provided for `networkconnectivity_v1::HubServiceClient` and `networkconnectivity_v1::PolicyBasedRoutingServiceClient`."],["Refer to the \"Best practices for managing service account keys\" guide for detailed information on service account key management and the \"Authentication Components\" for information on the factory functions."]]],[]]