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::contentwarehouse_v1::DocumentServiceClient(
google::cloud::contentwarehouse_v1::MakeDocumentServiceConnection(
options));
}
Follow these links to find examples for other *Client classes:
[[["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."],[[["The latest version available is 2.37.0-rc, with numerous other versions, starting at 2.36.0 and going all the way to 2.12.0, available for access."],["Client libraries typically use Application Default Credentials for authentication, but this can be overridden when required for certain applications."],["You can override the default authentication by using the `UnifiedCredentialsOption` and providing credentials, such as explicitly loading a service account key file."],["Examples of overriding authentication credentials are provided for multiple `*Client` classes, including `DocumentServiceClient`, `DocumentLinkServiceClient`, `DocumentSchemaServiceClient`, `RuleSetServiceClient`, and `SynonymSetServiceClient`."],["The guide suggests consulting the \"Best practices for managing service account keys\" for more details, and offers a link to \"Authentication Components\" for further information on creating `google::cloud::Credentials` objects."]]],[]]