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 document details how to override the default authentication credentials for Google Cloud services, which typically use Application Default Credentials."],["You can override the default credentials by providing the `UnifiedCredentialsOption`, as demonstrated with a service account key file example."],["The latest version of the documentation is `2.37.0-rc`, and the content covers versions down to `2.11.0`, offering access to version-specific details."],["The provided example shows how to load a service account key file and apply it to `composer_v1::EnvironmentsClient`, with links to examples for other client classes like `composer_v1::ImageVersionsClient`."],["The document also includes information about the Best Practices for managing service account keys, as well as a reference to the Authentication Components for further details."]]],[]]
