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 2025-03-14 UTC."],[[["This document provides a comprehensive list of versioned documentation for overriding authentication credentials in the Google Cloud C++ Service Directory client library, ranging from version 2.11.0 to the latest release candidate 2.37.0-rc."],["The default authentication method for the client libraries is Application Default Credentials, which may be overridden using the `UnifiedCredentialsOption`."],["The provided code example demonstrates how to load a service account key file explicitly using the `UnifiedCredentialsOption` and `MakeServiceAccountCredentials`."],["Examples are available for both `servicedirectory_v1::LookupServiceClient` and `servicedirectory_v1::RegistrationServiceClient` classes to show how to use the override in other contexts."],["For details on managing service account keys, and creating credentials objects, the document references the \"Best practices for managing service account keys\" and \"Authentication Components\" documentation respectively."]]],[]]
