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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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\u003eThe page provides documentation for various versions of the Binary Authorization C++ client library, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003eThis documentation explains how to override the default Application Default Credentials (ADC) by using the \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e, allowing users to authenticate with Google Cloud Services using alternative methods.\u003c/p\u003e\n"],["\u003cp\u003eAn example is provided that demonstrates how to explicitly load a service account key file to override the default credentials when using the \u003ccode\u003eBinauthzManagementServiceV1Client\u003c/code\u003e, the \u003ccode\u003eSystemPolicyV1Client\u003c/code\u003e, and the \u003ccode\u003eValidationHelperV1Client\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe documentation directs users to the "Best practices for managing service account keys" guide for more detailed information on managing service account keys.\u003c/p\u003e\n"],["\u003cp\u003eThe documentation also directs users to the "Authentication Components" section for further insights into creating \u003ccode\u003egoogle::cloud::Credentials\u003c/code\u003e objects.\u003c/p\u003e\n"]]],[],null,[]]
