Package signer providers functions for sign http request before request cloud.

Package token providers functions for initial http request body before request cloud.

AKSKOptionsFromEnv fills out an aksk.AKSKOptions structure with the settings found on the various HWCLOUD_* environment variables.

TokenOptionsFromEnv fills out an token.TokenOptions structure with the settings found on the various OpenStack OS_* environment variables.

AuthOptionsProvider presents the base of an auth options implementation.