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Showing content from https://cloud.google.com/cpp/docs/reference/apphub/2.27.0/apphub-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::apphub_v1::AppHubClient(
        google::cloud::apphub_v1::MakeAppHubConnection(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."],[[["The webpage provides documentation for overriding default authentication credentials when interacting with Google Cloud Services, using version 2.27.0 as the current version."],["The latest release candidate, version 2.37.0-rc, is available, along with links to documentation for various past versions, ranging from 2.23.0 to 2.36.0."],["While Application Default Credentials are used by default, developers can provide the UnifiedCredentialsOption to override this by explicitly loading a service account key file, as shown in the example code."],["The provided example in the documentation demonstrates a straightforward way to load a service account key file, though users are advised to refer to best practices for managing service account keys for more complex scenarios."],["The \"See Also\" section links to further information on authentication components and factory functions for creating `google::cloud::Credentials` objects, providing additional context on the authentication process."]]],[]]

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