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::support_v2::CaseAttachmentServiceClient(
google::cloud::support_v2::MakeCaseAttachmentServiceConnection(
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 provides documentation for overriding default authentication credentials in the Google Cloud C++ client libraries, specifically for `support_v2` services, including the `CaseAttachmentServiceClient`, `CaseServiceClient`, and `CommentServiceClient` classes."],["The latest release candidate version is 2.37.0-rc, and this documentation includes a list of available versions ranging from 2.11.0 to 2.37.0-rc."],["The default authentication method is Application Default Credentials, but users can override this by providing a `UnifiedCredentialsOption` and loading a service account key file, as shown in the provided code example."],["The example showcases how to load a service account key file and use it to create a `CaseAttachmentServiceClient`, and there are also links to similar examples for the `CaseServiceClient` and `CommentServiceClient`."],["Users are encouraged to consult the best practices for managing service account keys and the Authentication Components documentation for further details."]]],[]]
