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 2025-03-14 UTC."],[[["The latest stable version of the document is 2.36.0, while version 2.37.0-rc is available as the latest release candidate."],["This document provides a history of documentation, with versions ranging from 2.12.0 to 2.37.0-rc, all related to network services authentication overrides."],["The document explains how to override the default Application Default Credentials using the UnifiedCredentialsOption when interacting with Google Cloud Services."],["The document provides an example of how to load credentials explicitly from a service account key file, emphasizing its simplicity for demonstration."],["The provided content directs users to the Best practices for managing service account keys, as well as Authentication Components for more information on creating `google::cloud::Credentials`."]]],[]]