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::recommender_v1::RecommenderClient(
google::cloud::recommender_v1::MakeRecommenderConnection(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 2025-03-14 UTC."],[[["The latest version of the recommender documentation is 2.37.0-rc, with several prior versions available, ranging down to version 2.11.0."],["Client libraries generally utilize Application Default Credentials for authenticating with Google Cloud Services, but this default can be overridden."],["You can override default authentication by supplying the UnifiedCredentialsOption."],["A service account key file can be explicitly loaded to override default credentials, and the example code demonstrates this process."],["For comprehensive details on creating Credentials objects and key management best practices, consult the Authentication Components and the best practices guide for service account key management."]]],[]]
