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::iap_v1::IdentityAwareProxyAdminServiceClient(
google::cloud::iap_v1::MakeIdentityAwareProxyAdminServiceConnection(
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."],[[["The latest version available is 2.37.0-rc, with numerous other versions, starting at 2.11.0, also available for reference, all linked in the document."],["The document provides guidance on how to override the default Application Default Credentials (ADC) used by client libraries for authenticating with Google Cloud Services by using the `UnifiedCredentialsOption`."],["An example is provided that demonstrates how to load a service account key file to override the default authentication, utilizing the `MakeServiceAccountCredentials` function."],["The document references examples for how to override `IdentityAwareProxyAdminServiceClient` and `IdentityAwareProxyOAuthServiceClient`, and provides a link for best practices on managing service account keys."],["There is a link provided to review Authentication Components, which provides further information on factory functions to create `google::cloud::Credentials` objects."]]],[]]
