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 2025-03-14 UTC."],[[["This page provides documentation for overriding default authentication credentials when using Google Cloud Client Libraries, specifically focusing on the `UnifiedCredentialsOption`."],["The latest version covered in the documentation is 2.37.0-rc, with a range of versions from 2.11.0 up to 2.36.0 available for reference."],["Client libraries generally utilize Application Default Credentials for authentication, but users can override this by loading a service account key file using `UnifiedCredentialsOption`."],["The example demonstrates loading a service account key file and creating a `TranslationServiceClient` with custom credentials, offering an easy-to-understand illustration."],["For detailed information on managing service account keys and authentication components, refer to the provided links for best practices and factory functions for creating credentials objects."]]],[]]
