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::secretmanager_v1::SecretManagerServiceClient(
google::cloud::secretmanager_v1::MakeSecretManagerServiceConnection(
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."],[[["This webpage provides documentation for overriding default authentication credentials when using Google Cloud client libraries, specifically focusing on the `SecretManager` service."],["The latest version available is `2.37.0-rc`, while `2.20.0` is being looked at on this particular page, and there are multiple previous releases available for reference, ranging back to `2.10.1`."],["The primary method for overriding credentials involves utilizing the `UnifiedCredentialsOption` and providing credentials, such as those from a service account key file, using the `MakeServiceAccountCredentials` function."],["The example provided shows how to load a service account key file's contents and use it to override default authentication in a simple and easy to understand manner."],["The page directs users to additional resources, like the \"Best practices for managing service account keys\" guide and \"Authentication Components\" documentation, for more detailed information on managing service account keys and creating `google::cloud::Credentials` objects."]]],[]]
