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::connectors_v1::ConnectorsClient(
google::cloud::connectors_v1::MakeConnectorsConnection(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 2025-03-21 UTC."],[[["This document provides a reference for connectors and how to override authentication credentials using the C++ client library, covering a range of versions from 2.11.0 up to the latest release candidate 2.37.0-rc."],["The default authentication method for client libraries is Application Default Credentials, but you can override this by using the `UnifiedCredentialsOption`."],["You can explicitly load a service account key file by providing the key file content to the `MakeServiceAccountCredentials` function."],["For more details on managing service account keys, you can consult the \"Best practices for managing service account keys\" guide."],["The \"Authentication Components\" section provides further information on factory functions to create `google::cloud::Credentials` objects."]]],[]]
