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Showing content from https://cloud.google.com/cpp/docs/reference/domains/2.29.0/domains-override-authentication below:

C++ Client Libraries | Google Cloud

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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::domains_v1::DomainsClient(
        google::cloud::domains_v1::MakeDomainsConnection(options));
  }

Keep in mind that we chose this as an example because it is relatively easy to understand. Consult the Best practices for managing service account keys guide for more details.

Authentication Components - for more information on the factory functions to create google::cloud::Credentials objects.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-14 UTC.

[[["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 2025-08-14 UTC."],[[["This webpage provides documentation for various versions of the Google Cloud C++ client library, specifically related to the `domains-override-authentication` feature, ranging from version 2.12.0 up to the latest release candidate 2.37.0-rc."],["The documentation explains how to override the default Application Default Credentials (ADC) used for authenticating with Google Cloud Services, which is useful when default settings are not suitable for a user's specific needs."],["Overriding authentication can be accomplished by using `UnifiedCredentialsOption`, which allows users to provide custom credentials, such as a service account key file, to authenticate their client."],["The example in the content demonstrates loading a service account key file and utilizing it to create a `DomainsClient` with customized authentication settings, but it's advised to consult the best practices guide for security."],["The documentation also provides a link to `Authentication Components` for more details on creating `google::cloud::Credentials` objects."]]],[]]

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