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 2025-04-17 UTC."],[[["The webpage provides documentation for various versions of a C++ library, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc."],["The content primarily details how to override default authentication credentials when using the client libraries, typically for scenarios where Application Default Credentials are insufficient."],["The example demonstrates loading a service account key file using `UnifiedCredentialsOption` and `MakeServiceAccountCredentials` to establish explicit credentials."],["Users are advised to refer to the \"Best practices for managing service account keys\" guide for secure handling of service account credentials."],["The page provides a link to the \"Authentication Components\" page for more details on the factory functions used to create credentials objects."]]],[]]
