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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::tasks_v2::CloudTasksClient( google::cloud::tasks_v2::MakeCloudTasksConnection(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 page provides documentation for overriding default authentication credentials when using Google Cloud C++ client libraries, with a focus on the `UnifiedCredentialsOption`."],["The latest version covered in the documentation is 2.37.0-rc, and the page also includes documentation going back to version 2.11.0."],["The default authentication mechanism used by the C++ client libraries is Application Default Credentials, which can be overridden for specific needs, such as using a service account key file."],["The example provided shows how to explicitly load a service account key file using `google::cloud::UnifiedCredentialsOption` and `google::cloud::MakeServiceAccountCredentials`."],["The page links to further documentation on authentication components and best practices for managing service account keys for more in depth information."]]],[]]
