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::shell_v1::CloudShellServiceClient(
google::cloud::shell_v1::MakeCloudShellServiceConnection(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 2025-03-21 UTC."],[[["The latest version available is 2.37.0-rc, with numerous older versions, such as 2.36.0, 2.35.0, and so on, also listed on this page."],["Client libraries typically use Application Default Credentials for authentication with Google Cloud Services, but these can be overridden."],["You can override the default authentication by using the `UnifiedCredentialsOption`, as shown in the provided example, to explicitly load a service account key file."],["The provided code example demonstrates loading a service account key file to override default credentials, offering a simple method for managing authentication, but consider reviewing the best practices for managing service account keys for more information."],["The linked Authentication Components guide provides more details on the factory functions to create `google::cloud::Credentials` objects."]]],[]]
