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 lists various versions of the C++ client library, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc."],["The primary topic discussed is how to override the default authentication credentials used by the client libraries when interacting with Google Cloud Services."],["By default, client libraries utilize Application Default Credentials, but the `UnifiedCredentialsOption` allows for overriding this, as demonstrated using a service account key file."],["The example provided shows how to load a service account key file, setting it as an option within the `google::cloud::Options`, and creating a `CloudSchedulerClient` using the specified credentials."],["The document references the best practices guide for managing service account keys and provides a link to further information about authentication components and the creation of `google::cloud::Credentials`."]]],[]]
