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 2025-03-21 UTC."],[[["This document provides a guide on how to override default authentication credentials when using Google Cloud client libraries, allowing for custom authentication methods."],["The latest version of the service is 2.37.0-rc, while the current document is displaying version 2.24.0 along with a list of other versions available for the service."],["The example demonstrates how to override authentication by loading a service account key file using `UnifiedCredentialsOption` and `MakeServiceAccountCredentials`."],["Client libraries generally use Application Default Credentials for authentication, but these can be overridden when necessary."],["For more information about creating credentials objects, the document refers to the Authentication Components section."]]],[]]
