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::apikeys_v2::ApiKeysClient(
google::cloud::apikeys_v2::MakeApiKeysConnection(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 webpage provides a list of different versions of the API keys documentation, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc."],["It explains how to override the default authentication credentials used by client libraries, which typically rely on Application Default Credentials, by providing a UnifiedCredentialsOption."],["The provided code example demonstrates explicitly loading a service account key file to override default authentication, showcasing how to set up the necessary options and create an ApiKeysClient."],["The content advises users to consult the \"Best practices for managing service account keys\" guide for detailed information and also directs to the \"Authentication Components\" documentation for more information on factory functions related to `google::cloud::Credentials`."]]],[]]
