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::privateca_v1::CertificateAuthorityServiceClient(
google::cloud::privateca_v1::MakeCertificateAuthorityServiceConnection(
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 page provides documentation for various versions of the C++ client library for the Private Certificate Authority (Private CA) service, with versions ranging from 2.11.0 to 2.37.0-rc (latest)."],["The primary focus is on how to override the default authentication credentials using the `UnifiedCredentialsOption` in the C++ client library when connecting to Google Cloud Services."],["By providing a service account key file to the `UnifiedCredentialsOption`, you can explicitly define the authentication credentials instead of using the default Application Default Credentials (ADC)."],["The example code demonstrates loading a service account key file and using it to create a `CertificateAuthorityServiceClient` for authentication, and there are additional resources for best practices and managing service account keys, as well as authentication component details."]]],[]]
