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::channel_v1::CloudChannelServiceClient(
google::cloud::channel_v1::MakeCloudChannelServiceConnection(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 2025-03-14 UTC."],[[["This page provides documentation for overriding authentication credentials when using Google Cloud client libraries, specifically within the context of the Cloud Channel Service and versions 2.11.0 to 2.37.0-rc."],["By default, client libraries use Application Default Credentials, but users can override this by utilizing `UnifiedCredentialsOption`, as demonstrated in the code example provided."],["The documentation illustrates how to load a service account key file, offering an example for ease of understanding, and suggests consulting the best practices guide for managing service account keys for more information."],["The latest version listed is 2.37.0-rc, with a full list of available versions going down to version 2.11.0 available for this documentation."],["Additional information on the factory functions used to create `google::cloud::Credentials` objects can be found in the linked Authentication Components section."]]],[]]