Base on Plug.Builder, this module can be use-d into a module in order to build a plug pipeline:

defmodule MyApp.HelloController do
  use Oasis.Controller

  plug(Plug.Parsers,
    parsers: [:urlencoded],
    pass: ["*/*"]
  )

  def call(conn, opts) do
    conn = super(conn, opts)
    json(conn, %{"body_params" => conn.body_params})
  end
end

And provide some common functionality for easily use, this realization comes from Phoenix.Controller.