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ex_gram

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Telegram Bot API low level and framework

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ex_gram lib ex_gram plug.ex
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lib/ex_gram/plug.ex 

if Code.ensure_loaded?(Plug) do

  defmodule ExGram.Plug do

    @behaviour Plug



    alias Plug.Conn

    import Plug.Conn

    require Logger



    @impl true

    def init(opts), do: opts



    @impl true

    def call(%Conn{method: "POST"} = conn, _) do

      if "telegram" in conn.path_info do

        handle_update(conn)

      else

        conn

      end

    end



    def call(conn, _), do: conn



    defp handle_update(conn) do

      {:ok, body, conn} = Plug.Conn.read_body(conn)



      {status, message} =

        case get_req_header(conn, "x-telegram-bot-api-secret-token")

             |> check_secret_token() do

          :ok -> handle_update(conn, ExGram.Encoder.decode(body, keys: :atoms))

          {:error, error} -> {400, %{error: error}}

        end



      conn

      |> put_resp_content_type("application/json")

      |> send_resp(status, ExGram.Encoder.encode!(message))

      |> halt()

    end



    defp handle_update(conn, {:ok, update}) do

      token_hash = token_hash(conn.path_info)



      struct(ExGram.Model.Update, update)

      |> ExGram.Updates.Webhook.update(token_hash)



      {200, %{ok: true}}

    end



    defp handle_update(_conn, {:error, error}), do: {400, %{error: error}}



    defp check_secret_token([]) do

      Logger.debug(

        "The secret token is not configured in webhook mode. For security purposes, it is recommended to set one."

      )



      :ok

    end



    defp check_secret_token([secret_token]) do

      config_token = ExGram.Config.get(:ex_gram, :webhook)[:secret_token]



      case {secret_token, config_token} do

        {_secret_token, nil} ->

          message =

            "The secret token exists in the request header but is not configured in the application's settings."



          Logger.error(message)

          {:error, message}



        {secret_token, config_token} when secret_token != config_token ->

          message =

            "The secret token in the request header does not match the one configured in the webhook mode."



          Logger.error(message)

          {:error, message}



        {secret_token, config_token} when secret_token == config_token ->

          :ok

      end

    end



    defp token_hash([path]) when is_binary(path), do: path

    defp token_hash([_ | tl]), do: token_hash(tl)

  end

end