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 2025-03-05 UTC."],[[["The latest version available is 2.37.0-rc, with multiple other versions from 2.36.0 down to 2.23.0 also being accessible."],["Client libraries use Application Default Credentials for authentication with Google Cloud Services, unless configured otherwise."],["You can override default credentials by providing the UnifiedCredentialsOption, such as loading a service account key file explicitly."],["The example demonstrates loading a service account key file, but it's advised to consult the guide on best practices for managing service account keys."],["The Authentication Components link provides more information on the factory functions to create `google::cloud::Credentials` objects."]]],[]]
