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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::shell_v1::CloudShellServiceClient( google::cloud::shell_v1::MakeCloudShellServiceConnection(options)); }
[[["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 2025-04-23 UTC."],[[["This document provides versioned documentation for overriding authentication in the C++ client library, ranging from version 2.11.0 to 2.36.0, with a release candidate for version 2.37.0 available."],["The client libraries typically use Application Default Credentials for authentication, but this can be overridden using the `UnifiedCredentialsOption`."],["An example demonstrates how to load a service account key file explicitly to override default authentication settings, using the `UnifiedCredentialsOption` and `MakeServiceAccountCredentials`."],["The provided example is simplified for clarity, and users should refer to the best practices guide for managing service account keys for production environments."],["The document provides a `See Also` link, directing users to Authentication Components for further information on the factory functions to create credentials objects."]]],[]]
