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::kms_inventory_v1::KeyDashboardServiceClient(
google::cloud::kms_inventory_v1::MakeKeyDashboardServiceConnection(
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 2025-03-05 UTC."],[[["This document provides guidance on overriding default authentication credentials when interacting with Google Cloud Services, which by default utilizes Application Default Credentials."],["You can override the default authentication by supplying the `UnifiedCredentialsOption`, including the use of a service account key file."],["The provided example demonstrates how to explicitly load a service account key file to override the default credentials."],["This content also lists the different versions of the library, where the latest release candidate is 2.37.0-rc, and also provides examples for various client classes like `KeyDashboardServiceClient`, `KeyTrackingServiceClient`, `AutokeyAdminClient`, `AutokeyClient`, `EkmServiceClient`, and `KeyManagementServiceClient`."],["The documentation covers additional information on authentication with the provided link to the [Authentication Components](https://cloud.google.com/cpp/docs/reference/common/latest/group__guac.html) section and managing service accounts, with a link to [Best practices for managing service account keys](https://cloud.google.com/iam/docs/best-practices-for-managing-service-account-keys)."]]],[]]
