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::filestore_v1::CloudFilestoreManagerClient(
google::cloud::filestore_v1::MakeCloudFilestoreManagerConnection(
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."],[[["This page provides a comprehensive list of FileStore documentation versions, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc, each with a link to the documentation regarding overriding authentication."],["The default authentication method for client libraries is Application Default Credentials, but this can be overridden using the UnifiedCredentialsOption."],["The provided example demonstrates how to load a service account key file explicitly to override default authentication credentials, using the `UnifiedCredentialsOption`."],["For more details on managing service account keys and best practices, refer to the linked guide on the Google Cloud IAM documentation page."],["The Authentication Components section offers additional information about creating `google::cloud::Credentials` objects via factory functions."]]],[]]