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messenger_bot

1.0.0-rc.5
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Unofficial Facebook Messenger Platform chatbot client and webhook handler

Retired package: Deprecated
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messenger_bot lib messenger_bot client base.ex
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lib/messenger_bot/client/base.ex 

defmodule MessengerBot.Client.Base do

  @moduledoc false



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

  # MessengerBot Client core implementation                                  #

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



  use Tesla, only: ~w(get post delete)a

  alias MessengerBot.Util.JSON



  plug Tesla.Middleware.BaseUrl, "https://graph.facebook.com"

  plug MessengerBot.Client.Middleware.BearerAuth

  plug MessengerBot.Client.Middleware.StructResponse

  plug Tesla.Middleware.JSON, decode: &JSON.decode/1, encode: &JSON.encode/1

  plug MessengerBot.Client.Middleware.EventBus



  @api_version "v2.12"



  def rget(path, query_params, opts) do

    get(

      full_path(path),

      query: query_params,

      opts: opts_with_keys(opts)

    )

  end



  def rpost(path, req, opts) do

    post(

      full_path(path),

      req,

      opts: opts_with_keys(opts)

    )

  end



  def rdelete(path, req, opts) do

    delete(

      full_path(path),

      body: req,

      opts: opts_with_keys(opts)

    )

  end



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

  # PRIVATE                                                                  #

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



  defp full_path(path) do

    "/#{@api_version}#{path}"

  end



  defp opts_with_keys({app_id, page_id, topic, tx_id}) do

    tx_id = if is_nil(tx_id), do: unique_id(), else: tx_id

    [app_id: app_id, page_id: page_id, eb_topic: topic, eb_tx_id: tx_id]

  end



  defp unique_id do

    UUID.uuid4()

  end

end