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::containeranalysis_v1::ContainerAnalysisClient(
google::cloud::containeranalysis_v1::MakeContainerAnalysisConnection(
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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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 latest release candidate version is 2.37.0-rc, while the most recent stable release is 2.36.0, with a variety of previous versions ranging down to 2.11.0 also being accessible.\u003c/p\u003e\n"],["\u003cp\u003eClient libraries typically utilize Application Default Credentials for Google Cloud Service authentication, but you can override this by using the \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eTo override default credentials, you can provide a service account key file by loading it through the \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e, as demonstrated in the provided code snippet.\u003c/p\u003e\n"],["\u003cp\u003eExamples of overriding authentication are available for \u003ccode\u003econtaineranalysis_v1::ContainerAnalysisClient\u003c/code\u003e and \u003ccode\u003econtaineranalysis_v1::GrafeasClient\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe best practices for managing service account keys should be consulted to ensure proper security and handling of credentials when overriding the default authentication.\u003c/p\u003e\n"]]],[],null,[]]