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Showing content from https://cloud.google.com/cpp/docs/reference/composer/2.23.0/composer-override-authentication below:

C++ Client Libraries | Google Cloud

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How to Override the Authentication Credentials

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::composer_v1::EnvironmentsClient(
        google::cloud::composer_v1::MakeEnvironmentsConnection(options));
  }

Follow these links to find examples for other *Client classes:

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.

See Also

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 page documents how to override the default authentication credentials for Google Cloud services, which typically use Application Default Credentials."],["You can override the default credentials by providing the `UnifiedCredentialsOption`, as demonstrated in the provided example code snippet."],["The example shows how to explicitly load a service account key file to authenticate, which is one way to override the default credentials."],["This documentation covers several versions of the service, ranging from the latest release candidate, version 2.37.0-rc, all the way back to version 2.11.0."],["Further details on creating `google::cloud::Credentials` objects can be found in the Authentication Components section."]]],[]]


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