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 documents different versions of authentication credential overrides, ranging from version 2.11.0 up to the latest release candidate, 2.37.0-rc."],["The default authentication for client libraries uses Application Default Credentials, but this can be overridden when needed."],["You can override the default authentication by using the `UnifiedCredentialsOption`, which allows you to explicitly load a service account key file."],["The provided code example demonstrates loading a service account key file for overriding authentication, using `google::cloud::MakeServiceAccountCredentials`."],["For more information on managing service account keys, refer to the \"Best practices for managing service account keys\" guide and the Authentication Components for more details on `google::cloud::Credentials` objects."]]],[]]
