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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::accesscontextmanager_v1::AccessContextManagerClient( google::cloud::accesscontextmanager_v1:: MakeAccessContextManagerConnection(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 2025-03-21 UTC."],[[["The latest version available is 2.37.0-rc, with a variety of previous versions also accessible, all the way down to version 2.11.0."],["Client libraries primarily use Application Default Credentials for Google Cloud Services authentication, but users can override this setting."],["You can provide the `UnifiedCredentialsOption` to override default credentials, as demonstrated in the example that showcases loading a service account key file."],["The example provided is intended to be simple and easy to follow, and it's recommended to refer to the best practices guide for managing service account keys for more information."],["For details on creating `google::cloud::Credentials` objects, you can consult the Authentication Components documentation."]]],[]]
