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::DepServiceClient(
google::cloud::networkservices_v1::MakeDepServiceConnection(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 2025-03-21 UTC."],[[["This page provides documentation for overriding default authentication credentials when using Google Cloud C++ client libraries."],["The latest version, 2.37.0-rc, and many older versions of the library, ranging back to 2.12.0, are documented here with respect to overriding authentication."],["You can use `UnifiedCredentialsOption` to override the default credentials, as shown in the example, which demonstrates loading a service account key file."],["Examples are available for `networkservices_v1::DepServiceClient` and `networkservices_v1::NetworkServicesClient` to aid in understanding the process of overriding authentication."],["The page directs users to additional resources for best practices on managing service account keys and more information on authentication components."]]],[]]
