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::apphub_v1::AppHubClient(
google::cloud::apphub_v1::MakeAppHubConnection(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 document provides version-specific information and instructions for overriding default authentication credentials when using the Google Cloud C++ client libraries."],["The latest release candidate is version 2.37.0-rc, with other listed versions ranging from 2.36.0 down to 2.23.0."],["The default authentication method uses Application Default Credentials, which can be overridden by utilizing the `UnifiedCredentialsOption` with `MakeServiceAccountCredentials`, as demonstrated in the provided code example."],["For secure key management practices, refer to the \"Best practices for managing service account keys\" guide, as the example shown is only for demonstration purposes."],["More details on creating `google::cloud::Credentials` objects can be found in the Authentication Components documentation."]]],[]]
