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 2025-03-14 UTC."],[[["This page details how to override the default Application Default Credentials (ADC) for authenticating with Google Cloud Services, which is done by providing a `UnifiedCredentialsOption`."],["The latest release candidate version for this content is 2.37.0-rc, while the stable, currently presented version is 2.15.1."],["An example of overriding authentication using a service account key file is provided, demonstrating the use of `UnifiedCredentialsOption`, `MakeServiceAccountCredentials`, and how to load the keyfile contents."],["Examples for `iap_v1::IdentityAwareProxyAdminServiceClient` and `iap_v1::IdentityAwareProxyOAuthServiceClient` classes are linked, demonstrating the use of service accounts."],["The documentation also provides a link to best practices for managing service account keys and a link to the Authentication Components guide for creating `google::cloud::Credentials` objects."]]],[]]
