GetBasicAuthFromRequest returns basic auth username and password given a `*http.Request`.

ErrBasicAuthInvalid is returned when the basic authentication is invalid (missing header, invalid request, etc).

BasicAuthHandler is a http.Handler that uses BasicAuthWrapper to provide basic authentication support.

BasicAuthWrapper provides a wrapper that can authenticate using basic auth headers.

AuthProvider is a function that given a username, password and request, authenticates the user.