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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::translate_v3::TranslationServiceClient( google::cloud::translate_v3::MakeTranslationServiceConnection(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 provides documentation for overriding default authentication credentials when using Google Cloud client libraries, specifically within the context of C++ and the Translation API."],["The latest version documented is 2.37.0-rc, with a history of versions available, ranging from 2.36.0 down to 2.11.0 for the Translation API."],["The client libraries by default use Application Default Credentials (ADC) for authentication, but users can override this by utilizing the `UnifiedCredentialsOption`."],["An example demonstrates how to explicitly load a service account key file to override the default credentials, which is done by using the `MakeServiceAccountCredentials` function."],["For best security practices in managing service account keys, one should refer to the related Google Cloud guide, and the page also refers to the Authentication Components for more details on creating `google::cloud::Credentials` objects."]]],[]]
