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::video_livestream_v1::LivestreamServiceClient(
google::cloud::video_livestream_v1::MakeLivestreamServiceConnection(
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."],[[["The latest version available is 2.37.0-rc, with numerous other versions, down to 2.11.0, also listed for reference."],["By default, client libraries utilize Application Default Credentials for authenticating with Google Cloud Services, but this can be overridden."],["The `UnifiedCredentialsOption` allows overriding default credentials, such as by explicitly loading a service account key file."],["Examples are provided for `video_livestream_v1::LivestreamServiceClient`, `video_stitcher_v1::VideoStitcherServiceClient`, and `video_transcoder_v1::TranscoderServiceClient` to demonstrate how to implement custom authentication."],["Users should refer to the \"Best practices for managing service account keys\" guide for more information on managing credentials, and check the \"Authentication Components\" for details on creating `google::cloud::Credentials` objects."]]],[]]