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::resourcemanager_v3::FoldersClient(
google::cloud::resourcemanager_v3::MakeFoldersConnection(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 2025-03-14 UTC."],[[["The latest version available is 2.37.0-rc, with multiple previous versions from 2.36.0 to 2.11.0 also accessible, all related to resourcemanager-override-authentication."],["Client libraries typically use Application Default Credentials for Google Cloud Service authentication, but you can override this by using the UnifiedCredentialsOption."],["You can explicitly load a service account key file to override the default credentials by using the `UnifiedCredentialsOption` and `MakeServiceAccountCredentials`."],["There are multiple examples available for different `*Client` classes, including FoldersClient, OrganizationsClient, ProjectsClient, TagBindingsClient, TagHoldsClient, TagKeysClient, and TagValuesClient, which demonstrate how to override authentication credentials."],["The best practices for managing service account keys guide and Authentication Components documentation are provided as additional resources for more information."]]],[]]
