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::artifactregistry_v1::ArtifactRegistryClient(
google::cloud::artifactregistry_v1::MakeArtifactRegistryConnection(
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."],[[["This document provides a reference for overriding default authentication credentials when using Google Cloud client libraries for C++."],["The latest release candidate version available is 2.37.0-rc, with a detailed list provided from 2.37.0-rc down to version 2.11.0."],["The default authentication for client libraries is Application Default Credentials, but users can override this by using the `UnifiedCredentialsOption`."],["The example provided demonstrates how to load a service account key file to override default credentials, creating an ArtifactRegistryClient with custom options."],["Users are encouraged to consult the best practices guide for managing service account keys and can find more details on creating `google::cloud::Credentials` objects in the Authentication Components documentation."]]],[]]