defmodule PhaseDB.Server.Cowboy.HTTPHandler do
  alias PhaseDB.Server.Cowboy.WebsocketHandler

  @behaviour :cowboy_http

  @moduledoc """
  Implements enough oft he Cowboy HTTP protocol to pass it off to the websocket handler.
  """

  def init({transport, :http}, req, _) when transport in ~w|tcp ssl|a do
    case :cowboy_req.header("upgrade", req) do
      {"websocket", _} -> {:upgrade, :protocol, WebsocketHandler}
      {"WebSocket", _} -> {:upgrade, :protocol, WebsocketHandler}
      _                -> {:upgrade, :protocol, __MODULE__}
    end
  end
end