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::networkservices_v1::NetworkServicesClient(
google::cloud::networkservices_v1::MakeNetworkServicesConnection(
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."],[[["This document provides versioned documentation for overriding authentication in network services, with the latest version being 2.37.0-rc and ranging down to 2.12.0."],["By default, client libraries use Application Default Credentials for Google Cloud Services authentication, but the process to override this default is outlined here using the UnifiedCredentialsOption."],["An example demonstrates overriding the default authentication by loading a service account key file and providing it in the `google::cloud::UnifiedCredentialsOption`."],["The document links to additional resources, specifically \"Best practices for managing service account keys\" and \"Authentication Components\", for more in-depth information on service account key management and credential object creation."]]],[]]
