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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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 the C++ client library, specifically regarding Binary Authorization, with the latest release candidate version being 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003eThe client libraries typically use Application Default Credentials for authentication, but users can override this by using the \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe document demonstrates overriding the default authentication by providing a service account key file through \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e with example code.\u003c/p\u003e\n"],["\u003cp\u003eExamples are provided for multiple \u003ccode\u003eClient\u003c/code\u003e classes, including \u003ccode\u003eBinauthzManagementServiceV1Client\u003c/code\u003e, \u003ccode\u003eSystemPolicyV1Client\u003c/code\u003e, and \u003ccode\u003eValidationHelperV1Client\u003c/code\u003e, showing how to override the authentication credentials.\u003c/p\u003e\n"],["\u003cp\u003eUsers can refer to the Authentication Components documentation for details on creating \u003ccode\u003egoogle::cloud::Credentials\u003c/code\u003e objects and consult the best practices guide for managing service account keys.\u003c/p\u003e\n"]]],[],null,[]]
