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 page provides documentation for overriding authentication credentials when using the Google Cloud C++ client libraries."],["The client libraries generally use Application Default Credentials for authentication, but this can be overridden in specific cases."],["Users can override the default credentials by providing the `UnifiedCredentialsOption`, for instance, by loading a service account key file as shown in the example."],["The latest version available for documentation is 2.37.0-rc, but the documentation covers versions starting from 2.21.0."],["Refer to the provided links for best practices on managing service account keys and for more details on creating `google::cloud::Credentials` objects."]]],[]]
