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 2025-03-14 UTC."],[[["The webpage provides documentation for overriding default authentication credentials in Google Cloud client libraries, specifically focusing on the `UnifiedCredentialsOption`."],["Version 2.37.0-rc is the latest version available, and documentation spans back to version 2.11.0, offering historical information on this topic."],["Users can override the default authentication by providing a service account key file using the `UnifiedCredentialsOption`, as demonstrated in the provided code example."],["The webpage provides links to examples for `composer_v1::EnvironmentsClient` and `composer_v1::ImageVersionsClient` classes, showing how to implement service account authentication."],["Best practices for managing service account keys should be reviewed to ensure the security of the user's implementation, as referenced in a link to a dedicated guide."]]],[]]
