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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::backupdr_v1::BackupDRClient( google::cloud::backupdr_v1::MakeBackupDRConnection(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."],[[["This page details how to override the default authentication credentials used by client libraries when interacting with Google Cloud Services."],["The latest version available is 2.37.0-rc, with a range of versions available down to 2.23.0 for BackupDRClient functionalities."],["Overriding default authentication involves providing the `UnifiedCredentialsOption`, as exemplified by loading a service account key file."],["The provided code snippet demonstrates a simple way to load a service account key file and configure authentication using `MakeServiceAccountCredentials`."],["For comprehensive details on managing service account keys, refer to the linked \"Best practices for managing service account keys\" guide."]]],[]]
