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messenger_bot

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Unofficial Facebook Messenger Platform chatbot client and webhook handler

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messenger_bot lib messenger_bot web controllers messenger.ex
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lib/messenger_bot/web/controllers/messenger.ex 

defmodule MessengerBot.Web.Controller.Messenger do

  @moduledoc false



  import MessengerBot.Web.Controller.Base



  alias MessengerBot.Web.Renderer

  alias MessengerBot.Web.Service.{Callback, Setup}

  alias Plug.Conn



  @doc """

  Facebook Messenger Platform Setup handler

  """

  @spec setup(Conn.t()) :: Conn.t()

  def setup(conn) do

    case run_setup(conn) do

      {:ok, setup_params} ->

        Renderer.send_ok(conn, setup_params.challenge)



      {:error, error} ->

        Renderer.send_error(conn, error)

    end

  end



  @doc """

  Facebook Messenger Platform Webhook handler



  WARNING: 'checkout_update' and 'payment_pre_checkout' events are anti-pattern

  for this approach which require special response data. Thus, this package

  doesn't support the 'checkout_update' and 'payment_pre_checkout' events.

  """

  @spec callback(Conn.t()) :: Conn.t()

  def callback(conn) do

    conn

    |> run_callback()

    |> Renderer.send_ok()

  end



  ############################################################################

  # PRIVATE                                                                  #

  ############################################################################



  defp run_setup(conn) do

    params = [:app, :tx_id]

    %{app: app, tx_id: tx_id} = Map.take(conn.private, params)

    Setup.run(app, query_params(conn), tx_id)

  end



  defp run_callback(conn) do

    params = [:app, :body, :tx_id]

    %{app: app, body: body, tx_id: tx_id} = Map.take(conn.private, params)

    spawn(fn -> Callback.run(app.id, body, tx_id) end)



    conn

  end

end