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::certificatemanager_v1::CertificateManagerClient(
google::cloud::certificatemanager_v1::MakeCertificateManagerConnection(
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 2025-03-14 UTC."],[[["This webpage provides documentation for the Certificate Manager, detailing version-specific information and how to override default authentication credentials."],["The latest version documented is 2.37.0-rc, with a history of versions going back to 2.11.0."],["Users can override the default Application Default Credentials (ADC) by providing a `UnifiedCredentialsOption`, as demonstrated in the example with a service account key file."],["The `Authentication Components` section offers more information on factory functions for creating `google::cloud::Credentials` objects, and best practices for managing service account keys."]]],[]]
