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::secretmanager_v1::SecretManagerServiceClient(
google::cloud::secretmanager_v1::MakeSecretManagerServiceConnection(
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."],[[["The latest version available for the Secret Manager client library is 2.37.0-rc, and the page provides links to documentation for this and previous versions, dating back to 2.10.1."],["Client libraries typically use Application Default Credentials (ADC) for Google Cloud Services authentication, but this default can be overridden when required."],["Overriding default authentication involves providing a `UnifiedCredentialsOption`, as demonstrated with an example that uses a service account key file."],["The provided example for overriding credentials is for demonstration purposes; it is recommended to consult the \"Best practices for managing service account keys\" for more comprehensive security guidance."],["More information on the factory functions to create [`google::cloud::Credentials`](https://cloud.google.com/cpp/docs/reference/common/latest/classgoogle_1_1cloud_1_1Credentials.html) objects is available under [Authentication Components](https://cloud.google.com/cpp/docs/reference/common/latest/group__guac.html)."]]],[]]