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."],[[["The latest version available is 2.37.0-rc, with numerous other versions, starting at 2.36.0 and going all the way to 2.12.0, available for network services."],["Client libraries typically use Application Default Credentials for authentication with Google Cloud Services, but these defaults can be overridden when needed."],["To override the default authentication, users can use the UnifiedCredentialsOption and are given an example on loading a service account key file."],["For more information on managing service account keys, refer to the provided guide on best practices."],["More details on the factory functions that create `google::cloud::Credentials` objects can be found in the Authentication Components documentation."]]],[]]
