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::servicedirectory_v1::LookupServiceClient(
google::cloud::servicedirectory_v1::MakeLookupServiceConnection(
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 guidance on overriding default authentication credentials when interacting with Google Cloud Services using client libraries."],["The client libraries typically use Application Default Credentials, but you can override this by supplying a `UnifiedCredentialsOption`, demonstrated using a service account key file."],["Examples are available for `servicedirectory_v1::LookupServiceClient` and `servicedirectory_v1::RegistrationServiceClient` classes, illustrating how to load a service account key file for authentication."],["The document includes a list of available versions, with the latest being version `2.37.0-rc`."],["Refer to the \"Best practices for managing service account keys\" guide and \"Authentication Components\" for further information on service account key management and creating `google::cloud::Credentials` objects."]]],[]]
