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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::asset_v1::AssetServiceClient( google::cloud::asset_v1::MakeAssetServiceConnection(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 the webpage providing a list of versions ranging down to 2.11.0."],["The default authentication for client libraries uses Application Default Credentials, but this can be overridden."],["You can override the default authentication by providing a UnifiedCredentialsOption, such as loading a service account key file."],["The provided example demonstrates loading a service account key file for overriding authentication, while pointing to more complex best practices in the documentation."],["The document refers the user to Authentication Components for more information on creating `google::cloud::Credentials` objects."]]],[]]
