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Showing content from https://cloud.google.com/cpp/docs/reference/orgpolicy/2.32.0/orgpolicy-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::orgpolicy_v2::OrgPolicyClient(
        google::cloud::orgpolicy_v2::MakeOrgPolicyConnection(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 document provides version-specific documentation for the OrgPolicy API, ranging from version 2.11.0 to the latest release candidate 2.37.0-rc."],["The primary topic discussed is how to override the default authentication credentials used by client libraries, which by default leverage Application Default Credentials."],["Overriding authentication can be achieved by utilizing the `UnifiedCredentialsOption` and an example is provided demonstrating the loading of a service account key file."],["The example code is simplified for clarity, and users are encouraged to refer to the \"Best practices for managing service account keys\" guide for comprehensive details on secure key management."],["The document references external resources such as \"Authentication Components\", for additional details on how to create a `google::cloud::Credentials` objects."]]],[]]

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