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::accessapproval_v1::AccessApprovalClient(
google::cloud::accessapproval_v1::MakeAccessApprovalConnection(
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 available is 2.37.0-rc, with numerous preceding versions, such as 2.36.0, 2.35.0, and so on, listed for reference, down to the base version of 2.11.0."],["Client libraries typically authenticate with Google Cloud Services using Application Default Credentials, which can be overridden when needed."],["To override default authentication, you can use the UnifiedCredentialsOption, with an example provided showing how to load a service account key file explicitly."],["The example provided on how to override default authentication is a simplified example for ease of understanding, and it's suggested to consult best practices for managing service account keys for further detail."],["You can get more information on creating `google::cloud::Credentials` objects by consulting the Authentication Components documentation."]]],[]]
