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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::oslogin_v1::OsLoginServiceClient( google::cloud::oslogin_v1::MakeOsLoginServiceConnection(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 2025-04-09 UTC."],[[["This webpage provides documentation for various versions of the `oslogin-override-authentication`, with version `2.37.0-rc` being the latest release candidate."],["The client libraries typically use Application Default Credentials for authentication with Google Cloud Services, but this default can be overridden."],["You can override default authentication credentials by using the `UnifiedCredentialsOption`, allowing you to specify alternative credentials like a service account key file."],["The webpage includes a code example demonstrating how to load a service account key file to override the default authentication behavior using the `UnifiedCredentialsOption`."],["The 'See Also' section provides a link to the Authentication Components documentation, offering more information on creating `google::cloud::Credentials` objects."]]],[]]
