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, specifically focusing on how to utilize a service account key file for authentication."],["The documentation covers multiple versions of the client library, from version 2.11.0 up to the latest release candidate 2.37.0-rc."],["It demonstrates how to override authentication by providing the `UnifiedCredentialsOption` and using `MakeServiceAccountCredentials` to load a service account key file, illustrated with a code example."],["Examples are available for various client classes, such as `notebooks_v1::ManagedNotebookServiceClient`, `notebooks_v1::NotebookServiceClient`, and `notebooks_v2::NotebookServiceClient`."],["Users are encouraged to follow best practices for service account key management, and there is a link to the \"Best practices for managing service account keys\" guide for more details, as well as link to Authentication Components."]]],[]]
