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::cloudcontrolspartner_v1::
CloudControlsPartnerCoreClient(
google::cloud::cloudcontrolspartner_v1::
MakeCloudControlsPartnerCoreConnection(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 2025-03-05 UTC."],[[["This page documents how to override the default authentication credentials used by the client libraries, which typically rely on Application Default Credentials."],["Overriding the default authentication can be accomplished by providing a `UnifiedCredentialsOption`, such as by loading a service account key file."],["The example shown utilizes a service account key file to create `google::cloud::UnifiedCredentialsOption` which in turn sets up a `CloudControlsPartnerCoreClient`."],["There are similar examples available for other `*Client` classes, such as `CloudControlsPartnerMonitoringClient`."],["For best practices on managing service account keys, refer to the provided link, and also see the Authentication Components section for factory functions related to creating `google::cloud::Credentials` objects."]]],[]]
