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::websecurityscanner_v1::WebSecurityScannerClient(
google::cloud::websecurityscanner_v1::MakeWebSecurityScannerConnection(
options));
}
[[["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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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 webpage provides a comprehensive list of Web Security Scanner versions, ranging from the latest release candidate (2.37.0-rc) down to version 2.11.0, each with a link to its documentation.\u003c/p\u003e\n"],["\u003cp\u003eThe content explains how to override the default authentication credentials used by client libraries, which normally utilize Application Default Credentials (ADC).\u003c/p\u003e\n"],["\u003cp\u003eThe provided code snippet demonstrates how to explicitly load a service account key file using \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e, offering a method for custom authentication.\u003c/p\u003e\n"],["\u003cp\u003eThe page references the "Best practices for managing service account keys" guide for more in-depth information on service account management.\u003c/p\u003e\n"],["\u003cp\u003eThere is also a section on Authentication Components, with a link, that leads to information on factory functions to create \u003ccode\u003egoogle::cloud::Credentials\u003c/code\u003e objects.\u003c/p\u003e\n"]]],[],null,[]]
