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::backupdr_v1::BackupDRClient(
google::cloud::backupdr_v1::MakeBackupDRConnection(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 document provides guidance on overriding default authentication credentials when interacting with Google Cloud Services, which are typically managed using Application Default Credentials."],["Users can override default credentials by providing the `UnifiedCredentialsOption`, exemplified by explicitly loading a service account key file."],["The example demonstrates setting custom authentication options using `google::cloud::UnifiedCredentialsOption` and `MakeServiceAccountCredentials` to authenticate."],["There are multiple client library versions available, ranging from 2.23.0 to 2.37.0-rc, each offering a documentation link to the `/backupdr-override-authentication` reference page."],["Additional information on managing service account keys and creating `google::cloud::Credentials` objects is available in the linked guides and documentation."]]],[]]
