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::advisorynotifications_v1::
AdvisoryNotificationsServiceClient(
google::cloud::advisorynotifications_v1::
MakeAdvisoryNotificationsServiceConnection(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 2025-08-14 UTC."],[[["\u003cp\u003eThis page documents different versions of the C++ library for overriding authentication in Google Cloud's Advisory Notifications service, ranging from version 2.11.0 to the latest release candidate, 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003eThe latest version available is 2.37.0-rc, which can be found at \u003ccode\u003e/cpp/docs/reference/advisorynotifications/latest/advisorynotifications-override-authentication\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe content explains how to override the default authentication credentials using the \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e, particularly showcasing an example of loading a service account key file.\u003c/p\u003e\n"],["\u003cp\u003eIt highlights the importance of consulting the "Best practices for managing service account keys" guide for secure service account management.\u003c/p\u003e\n"],["\u003cp\u003eThe "Authentication Components" link provides further resources on the factory functions used to create \u003ccode\u003egoogle::cloud::Credentials\u003c/code\u003e objects.\u003c/p\u003e\n"]]],[],null,[]]
