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 2025-03-21 UTC."],[[["The webpage provides documentation for various versions of a C++ library, ranging from version 2.11.0 to the latest release candidate, 2.37.0-rc."],["The content primarily addresses how to override the default authentication credentials used by the client libraries when interacting with Google Cloud Services."],["The default authentication mechanism is Application Default Credentials, but the `UnifiedCredentialsOption` allows for explicit credential specification, like loading a service account key file."],["The provided code example demonstrates the process of overriding the default authentication by reading the contents of a service account key file and creating a `UnifiedCredentialsOption` with it."],["The documentation recommends consulting the \"Best practices for managing service account keys\" guide for more information and also references the \"Authentication Components\" for details on factory functions for credentials objects."]]],[]]
