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::apikeys_v2::ApiKeysClient(
google::cloud::apikeys_v2::MakeApiKeysConnection(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."],[[["The webpage provides documentation for overriding default authentication credentials when using Google Cloud client libraries, with version 2.17.0 being the oldest and 2.37.0-rc being the latest version."],["The client libraries typically use Application Default Credentials (ADC) for authentication, but this can be overridden when required for certain applications."],["Overriding default credentials involves utilizing the `UnifiedCredentialsOption` and provides an example on how to explicitly load a service account key file."],["The documentation also contains a reference to the best practices for managing service account keys and other authentication components."],["The webpage lists a range of version numbers, from 2.17.0 to 2.37.0-rc, of the C++ library associated with overriding API keys authentication, and provides the paths to the documentation for each."]]],[]]
