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::storagetransfer_v1::StorageTransferServiceClient(
google::cloud::storagetransfer_v1::MakeStorageTransferServiceConnection(
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 2025-04-22 UTC."],[[["This webpage provides a comprehensive list of Storage Transfer Service versions, ranging from the latest release candidate (2.37.0-rc) down to version 2.11.0."],["The client libraries primarily use Application Default Credentials for authentication with Google Cloud Services, but it is possible to override this default."],["You can override the default authentication by utilizing the UnifiedCredentialsOption and providing credentials, such as loading a service account key file, demonstrated by an example in the documentation."],["For further details on managing service account keys, it's recommended to consult the \"Best practices for managing service account keys\" guide."],["The \"Authentication Components\" section offers more information on the factory functions used to create `google::cloud::Credentials` objects."]]],[]]
