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 2025-05-07 UTC."],[[["This document provides a version history for the C++ client library related to Identity-Aware Proxy (IAP), with versions ranging from 2.11.0 to 2.37.0-rc."],["The latest release candidate version is 2.37.0-rc, and each version has its corresponding documentation link to the `iap-override-authentication` section."],["The client libraries typically use Application Default Credentials for authentication with Google Cloud Services, but this can be overridden using the `UnifiedCredentialsOption`."],["The document provides a code example demonstrating how to override the default authentication by loading a service account key file, which can be found at the provided link for the [`iap_v1::IdentityAwareProxyAdminServiceClient`](/cpp/docs/reference/iap/2.11.0/iap_v1_1_1IdentityAwareProxyAdminServiceClient-service-account-snippet)."],["Additional information on authentication components, including creating `google::cloud::Credentials` objects, can be found in the linked \"Authentication Components\" guide."]]],[]]
