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 document lists available versions of the Network Connectivity C++ client library, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc."],["The latest non-release candidate version available is 2.36.0, while the current version detailed in this specific page is 2.28.0."],["The documentation outlines how to override the default authentication method using `UnifiedCredentialsOption` and provides a code example that loads a service account key file for authentication."],["Links are provided for examples with `HubServiceClient` and `PolicyBasedRoutingServiceClient` classes, demonstrating how to implement service account authentication."],["The documentation refers users to external documentation to understand the best practices for managing service account keys."]]],[]]
