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::deploy_v1::CloudDeployClient(
google::cloud::deploy_v1::MakeCloudDeployConnection(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 documentation for overriding default authentication credentials in the C++ client libraries for Google Cloud services."],["The latest release candidate for this documentation is version 2.37.0-rc, with numerous older versions also available."],["The default authentication method is Application Default Credentials, but alternative methods are available, including using a service account key file."],["An example demonstrates loading a service account key file using `google::cloud::UnifiedCredentialsOption`."],["The \"Authentication Components\" section and the \"Best practices for managing service account keys\" guide are included for further information."]]],[]]
