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::ids_v1::IDSClient(
google::cloud::ids_v1::MakeIDSConnection(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 2025-03-05 UTC."],[[["The webpage documents different versions of the C++ library, ranging from version 2.11.0 up to the latest release candidate, 2.37.0-rc, with each version linking to its own page on overriding authentication."],["The main topic of the provided documentation is how to override the default Application Default Credentials (ADC) for authenticating with Google Cloud Services."],["Overriding default credentials can be done by using the `UnifiedCredentialsOption`, as demonstrated with an example that loads a service account key file."],["It's recommended to review the \"Best practices for managing service account keys\" for more information when overriding the default authentication."],["For more information on factory functions for creating credentials objects, refer to the \"Authentication Components\" section of the C++ library."]]],[]]
