Add login next url parameter for auth redirects

lib/sso_bsn_web/controllers/user_session_controller.ex

@@ -9,7 +9,6 @@ defmodule SsoBsnWeb.UserSessionController do
       {:ok, user} ->
         conn
         |> UserAuth.log_in_user(user) # TODO: pass through remember-me value?
-        |> redirect(to: ~p"/users/settings")
       {:error, error} ->
         dbg(error)
         conn
@@ -32,4 +31,8 @@ defmodule SsoBsnWeb.UserSessionController do
       username: user.username
     })
   end
+
+  def redirect_next(conn, %{ "next" => next }) do
+    conn |> redirect(external: next)
+  end
 end