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::composer_v1::EnvironmentsClient(
google::cloud::composer_v1::MakeEnvironmentsConnection(options));
}
Follow these links to find examples for other *Client classes:
[[["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 page details how to override the default Application Default Credentials (ADC) for authenticating with Google Cloud Services, which is done by providing a `UnifiedCredentialsOption`."],["The content provides a code example demonstrating how to load a service account key file to override the default authentication, and then set the `UnifiedCredentialsOption`."],["The latest available version is 2.37.0-rc, and the page shows a comprehensive list of all other version releases from 2.11.0 to 2.36.0, all related to overriding authentication credentials."],["It refers to the guide \"Best practices for managing service account keys\" and the \"Authentication Components\" section for further details and best practices on handling service account keys."],["The page uses examples from the `composer_v1::EnvironmentsClient` and `composer_v1::ImageVersionsClient` classes to demonstrate the process."]]],[]]
