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::scheduler_v1::CloudSchedulerClient(
google::cloud::scheduler_v1::MakeCloudSchedulerConnection(options));
}
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-04-02 UTC."],[[["This document provides versioned documentation for overriding authentication credentials within the Google Cloud C++ client libraries, covering versions from 2.11.0 up to the latest release candidate 2.37.0-rc."],["The client libraries typically use Application Default Credentials for Google Cloud Service authentication, but this can be overridden using `UnifiedCredentialsOption`."],["The provided code example illustrates how to override the default credentials by explicitly loading a service account key file using the `MakeServiceAccountCredentials` function."],["For detailed information on managing service account keys, users should refer to the \"Best practices for managing service account keys\" guide."],["More details on creating `google::cloud::Credentials` objects can be found in the \"Authentication Components\" documentation."]]],[]]
