catch-all action

catch_all_action.ex

defmodule MyApp.Web do

  def controller do 
    quote do
      use Phoenix.Controller
      use MyApp.CatchAllController
      ...
    end
  end
end

defmodule MyApp.CatchAllController do
  defmacro __using__(_opts) do
    quote do
      @before_compile unquote(__MODULE__)
    end
  end
  
  defmacro __before_compile__(_env) do
    for action <- [:new, :edit, :show, :index, :update, :delete] do
      quote do
        def unquote(action)(conn, _params) do
          Plug.Conn.send_resp(conn, 400, "")
        end
      end
    end
  end
end