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 2025-03-05 UTC."],[[["This webpage provides documentation for various versions of the CertificateManager, ranging from version 2.11.0 up to the latest release candidate, 2.37.0-rc."],["The default authentication method for client libraries is Application Default Credentials, but users can override this setting when needed."],["To override default authentication, the `UnifiedCredentialsOption` can be provided to load a service account key file, as shown in the example."],["The provided example in the documentation uses a service account key file to demonstrate overriding authentication credentials within `UnifiedCredentialsOption`, in an easy to understand format."],["The documentation references the \"Best practices for managing service account keys\" guide for more details, alongside a link to the Authentication Components for more information on `google::cloud::Credentials`."]]],[]]
