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::notebooks_v1::ManagedNotebookServiceClient(
google::cloud::notebooks_v1::MakeManagedNotebookServiceConnection(
options));
}
Follow these links to find examples for other *Client classes:
[[["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 provides documentation for overriding default authentication credentials when using Google Cloud client libraries, which typically rely on Application Default Credentials."],["You can override the default authentication by providing the `UnifiedCredentialsOption`, demonstrated in an example showing how to load a service account key file."],["The content includes a list of versions ranging from `2.11.0` to `2.36.0`, plus `2.37.0-rc` (latest), each linking to documentation related to overriding authentication, and the latest version is not final yet."],["The page references examples for various `*Client` classes, such as `notebooks_v1::ManagedNotebookServiceClient`, `notebooks_v1::NotebookServiceClient`, and `notebooks_v2::NotebookServiceClient`."],["It also contains a link to the \"Best practices for managing service account keys\" guide and the \"Authentication Components\" page for in-depth information."]]],[]]