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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)); }
[[["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 2025-03-05 UTC."],[[["This document details how to override the default authentication credentials used by client libraries when interacting with Google Cloud Services."],["The default authentication uses Application Default Credentials, but specific credentials can be loaded using `UnifiedCredentialsOption` if necessary."],["An example is provided showcasing how to explicitly load a service account key file to override authentication, which is relatively straightforward to understand."],["The provided code snippet demonstrates setting authentication options using `google::cloud::UnifiedCredentialsOption` with a service account key file."],["Users are encouraged to consult the \"Best practices for managing service account keys\" guide for advanced credential management and the Authentication Components section for more info on creating `google::cloud::Credentials`."]]],[]]
