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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."],[[["This page provides documentation for overriding default authentication credentials when using Google Cloud client libraries, with version-specific information ranging from 2.11.0 to the latest release candidate 2.37.0-rc."],["Client libraries typically use Application Default Credentials, but you can override this by providing the UnifiedCredentialsOption."],["A service account key file can be loaded to explicitly override the default credentials, as demonstrated in the provided code example."],["The page links to best practices for managing service account keys and additional details on authentication components."],["The documentation covers a range of versions, detailing documentation for each release from version 2.11.0 up to the latest release candidate, version 2.37.0-rc."]]],[]]
