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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::composer_v1::EnvironmentsClient( google::cloud::composer_v1::MakeEnvironmentsConnection(options)); }
Follow these links to find examples for other *Client classes:
[[["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 2025-06-10 UTC."],[[["This document provides information on how to override the default authentication credentials used by client libraries to connect with Google Cloud Services."],["The default authentication method is the Application Default Credentials, but this can be overridden using the UnifiedCredentialsOption."],["An example is provided for explicitly loading a service account key file to override the default, and this example can be applied to other client classes as well."],["The latest version covered in this documentation is 2.37.0-rc, and a list of previous versions, down to 2.11.0, are available and linked."],["For more details on service account key management, refer to the \"Best practices for managing service account keys\" guide."]]],[]]
