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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 2025-03-21 UTC."],[[["The latest version of the documentation is 2.37.0-rc, with a full listing of versions ranging from 2.37.0-rc down to 2.11.0 available for viewing."],["By default, client libraries utilize Application Default Credentials (ADC) for authentication with Google Cloud Services."],["You can override the default authentication by supplying a `UnifiedCredentialsOption`, such as loading a service account key file directly, which is shown in the provided example code."],["The example code demonstrates loading a service account key file to override default credentials, while referencing the best practices for managing these keys."],["For further details on creating `google::cloud::Credentials` objects, you can refer to the Authentication Components section."]]],[]]
