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::developerconnect_v1::DeveloperConnectClient(
google::cloud::developerconnect_v1::MakeDeveloperConnectConnection(
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 page details how to override the default authentication credentials used by client libraries when interacting with Google Cloud Services."],["The client libraries primarily utilize Application Default Credentials for authentication, but alternatives can be implemented."],["Users can override the default authentication by using the `UnifiedCredentialsOption` and, for example, loading a service account key file."],["The provided code demonstrates explicitly loading a service account key file using `MakeServiceAccountCredentials`, though this is one example, and the page highlights the existence of others."],["For further information, this documentation makes reference to best practices for managing service account keys and the Authentication Components page for more details on creating `google::cloud::Credentials` objects."]]],[]]
