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::commerce_consumer_procurement_v1::
ConsumerProcurementServiceClient(
google::cloud::commerce_consumer_procurement_v1::
MakeConsumerProcurementServiceConnection(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 2025-03-05 UTC."],[[["This document provides version-specific documentation for overriding authentication credentials in the C++ client libraries, ranging from version 2.14.0 to the latest release candidate 2.37.0-rc."],["By default, the client libraries use Application Default Credentials for Google Cloud Service authentication, but this can be overridden when necessary."],["You can override the default credentials by providing a `UnifiedCredentialsOption`, such as explicitly loading a service account key file as demonstrated in the example code."],["The provided example shows how to load a service account key file, a relatively easy-to-understand method, and users should consult the guide on best practices for managing service account keys."],["The Authentication Components page provides information on factory functions for creating `google::cloud::Credentials` objects."]]],[]]
