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::translate_v3::TranslationServiceClient(
google::cloud::translate_v3::MakeTranslationServiceConnection(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."],[[["This page provides documentation for overriding default authentication credentials when using Google Cloud client libraries for C++."],["The latest version for overriding authentication credentials is `2.37.0-rc`, with a list of versions dating back to `2.11.0` being available for the `translate-override-authentication` reference documentation."],["By default, client libraries utilize Application Default Credentials for authentication, but this can be overridden using the `UnifiedCredentialsOption`."],["The documentation demonstrates how to override the default credentials by explicitly loading a service account key file using `google::cloud::MakeServiceAccountCredentials`."],["Users are encouraged to review the \"Best practices for managing service account keys\" guide and \"Authentication Components\" for detailed information on security and creating `google::cloud::Credentials` objects, respectively."]]],[]]
