Authenticate user by using configured authorization methods and scopes.

Examples

required_scopes = ~w(read write)
result = Gandalf.Plug.Authenticate.authorize_for_resource(conn,
  required_scopes)
case result do
  {:error, errors, _} -> IO.inspect(errors)
  nil -> IO.puts("not authencated!")
  {:ok, current_user} -> IO.puts(current_user.email)
end