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::eventarc_publishing_v1::PublisherClient(
google::cloud::eventarc_publishing_v1::MakePublisherConnection(
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 2025-03-05 UTC."],[[["The latest release candidate version is 2.37.0-rc, and a range of other versions are available, from 2.36.0 down to 2.11.0, all providing links to their respective documentation for overriding authentication."],["Client libraries primarily use Application Default Credentials for authentication, but users can override this by utilizing the `UnifiedCredentialsOption` for custom needs."],["You can load a service account key file to authenticate by using `MakeServiceAccountCredentials` and providing the file's contents."],["Examples are available for `eventarc_publishing_v1::PublisherClient` and `eventarc_v1::EventarcClient` classes to illustrate the override process, but more details can be found in the Best practices guide."],["For additional details on creating `google::cloud::Credentials` objects, users can consult the Authentication Components documentation."]]],[]]