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::servicehealth_v1::ServiceHealthClient(
google::cloud::servicehealth_v1::MakeServiceHealthConnection(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 2025-04-17 UTC."],[[["This document provides a guide on how to override default authentication credentials when using Google Cloud client libraries, using service health as an example."],["The client libraries typically use Application Default Credentials, but users can override this using `UnifiedCredentialsOption`."],["An example demonstrates how to explicitly load a service account key file for authentication using the provided code snippet and the `MakeServiceAccountCredentials` function."],["The document includes a list of service health client versions, ranging from 2.21.0 to 2.37.0-rc."],["Users are advised to consult the \"Best practices for managing service account keys\" guide for more information and to check the \"Authentication Components\" for factory functions."]]],[]]
