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 document provides a guide on how to override default authentication credentials when using Google Cloud client libraries, offering an example using a service account key file."],["The latest release candidate version of the documentation is 2.37.0-rc, with a range of documentation versions available from 2.36.0 down to 2.12.0."],["The provided code example demonstrates how to load a service account key file to explicitly set credentials via the `UnifiedCredentialsOption`."],["There are links provided for further examples that use `networkservices_v1::DepServiceClient` and `networkservices_v1::NetworkServicesClient` to override default credentials."],["The documentation highlights best practices for managing service account keys and includes a link to additional information regarding authentication components."]]],[]]
