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 details how to override the default authentication credentials for Google Cloud client libraries, specifically within the context of network connectivity."],["The latest release candidate is version 2.37.0-rc, with the document itself pertaining to version 2.34.0 and covering multiple prior versions up to 2.11.0."],["The provided code snippet demonstrates overriding credentials by loading a service account key file, which then sets the authentication for `HubServiceClient` by using `UnifiedCredentialsOption`."],["Links are available for service account examples for both `HubServiceClient` and `PolicyBasedRoutingServiceClient` within the 2.34.0 version."],["The document advises users to review best practices for managing service account keys and also directs them to the \"Authentication Components\" page for additional information on creating `Credentials` objects."]]],[]]