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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::tasks_v2::CloudTasksClient( google::cloud::tasks_v2::MakeCloudTasksConnection(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 2025-04-02 UTC."],[[["This page provides documentation for overriding default authentication credentials in C++ client libraries when interacting with Google Cloud Services."],["The latest version available is 2.37.0-rc, and the page contains documentation for various versions, from 2.37.0-rc down to 2.11.0, each with its specific documentation page."],["By utilizing `UnifiedCredentialsOption`, developers can explicitly load service account key files to customize the authentication process."],["The example demonstrates how to load a service account key file via a basic code snippet using `MakeServiceAccountCredentials` and `UnifiedCredentialsOption` to override the default credentials."],["For a more in-depth explanation on creating `Credentials` objects, refer to the Authentication Components documentation."]]],[]]
