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::speech_v1::AdaptationClient(
google::cloud::speech_v1::MakeAdaptationConnection(options));
}
Follow these links to find examples for other *Client classes:
[[["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 document provides information on how to override the default authentication credentials used by Google Cloud client libraries, which typically use Application Default Credentials."],["You can override the default credentials by using the `UnifiedCredentialsOption` to load specific credentials, such as a service account key file, as shown in the provided code example."],["The latest version available in this documentation is 2.37.0-rc, and it outlines the history of different versions going down to version 2.11.0."],["Examples are provided for overriding credentials for `speech_v1::AdaptationClient`, `speech_v1::SpeechClient`, and `speech_v2::SpeechClient` classes, and the documentation advises to check the best practices guide for service account key management."],["The \"See Also\" section directs users to the Authentication Components documentation for more details on creating `google::cloud::Credentials` objects."]]],[]]
