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::ids_v1::IDSClient(
google::cloud::ids_v1::MakeIDSConnection(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 webpage lists available versions of the C++ client library, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc, with each version linking to its respective documentation on overriding authentication."],["By default, the C++ client libraries use Application Default Credentials for authenticating with Google Cloud Services, but this can be overridden."],["You can override the default authentication by using `UnifiedCredentialsOption` to provide custom credentials, such as loading a service account key file."],["The provided example shows how to explicitly load a service account key file, but users should consult best practices for managing service account keys."],["For further information on creating `google::cloud::Credentials` objects, users can refer to the Authentication Components documentation."]]],[]]
