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::binaryauthorization_v1::
BinauthzManagementServiceV1Client(
google::cloud::binaryauthorization_v1::
MakeBinauthzManagementServiceV1Connection(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"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["\u003cp\u003eThis page provides documentation for various versions of the C++ client library for Binary Authorization, ranging from version 2.11.0 to the latest release candidate 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003eThe client libraries primarily use Application Default Credentials for authentication with Google Cloud Services, but they can be overridden when required.\u003c/p\u003e\n"],["\u003cp\u003eAuthentication credentials can be overridden by setting the \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e, demonstrated with an example of loading a service account key file.\u003c/p\u003e\n"],["\u003cp\u003eExamples are provided for overriding authentication in the \u003ccode\u003eBinauthzManagementServiceV1Client\u003c/code\u003e, \u003ccode\u003eSystemPolicyV1Client\u003c/code\u003e, and \u003ccode\u003eValidationHelperV1Client\u003c/code\u003e classes.\u003c/p\u003e\n"],["\u003cp\u003eThe page directs users to a guide on best practices for managing service account keys and to the Authentication Components documentation for more information on creating credentials objects.\u003c/p\u003e\n"]]],[],null,[]]
