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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 services setup params.ex
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lib/messenger_bot/web/services/setup/params.ex 

defmodule MessengerBot.Web.Service.Setup.Params do

  @moduledoc false



  alias MessengerBot.Model.Error



  defstruct [:app_id, :challenge, :mode, :verify_token]



  @type t :: %__MODULE__{

          app_id: String.t(),

          challenge: String.t(),

          mode: String.t(),

          verify_token: String.t()

        }



  @required_params ~w(hub.challenge hub.mode hub.verify_token)



  @spec build(String.t(), map()) :: {:ok, t()} | Error.t()

  def build(app_id, %{"hub.challenge" => _, "hub.mode" => _, "hub.verify_token" => _} = params) do

    setup_params = %__MODULE__{

      app_id: app_id,

      challenge: to_string(params["hub.challenge"]),

      mode: to_string(params["hub.mode"]),

      verify_token: to_string(params["hub.verify_token"])

    }



    {:ok, setup_params}

  end



  def build(app_id, params) do

    missing_params = @required_params -- Map.keys(params)

    %Error{

      app_id: app_id,

      code: :unprocessable_entity,

      details: %{missing_params: missing_params}

    }

  end

end