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messenger_bot

1.2.0
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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 middlewares bearer_auth.ex
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lib/messenger_bot/client/middlewares/bearer_auth.ex 

defmodule MessengerBot.Client.Middleware.BearerAuth do

  @moduledoc false



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

  # Tesla Middleware implementation for Bearer Auth Headers                  #

  # Middleware doesn't block the call when auth token not found for page ref,#

  # it

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



  alias MessengerBot.Config



  @behaviour Tesla.Middleware



  def call(env, next, _opts) do

    case Keyword.get(env.query, :access_token) do

      nil -> continue_with_credentials_from_page_ref(env, next)



      token -> continue_with_auth_header(env, next, token)

    end

  end



  defp continue_with_credentials_from_page_ref(env, next) do

    case page_access_token(env.opts) do

      {:ok, token} -> continue_with_auth_header(env, next, token)



      {:error, reason} -> {:error, reason}

    end

  end



  defp page_access_token(opts) do

    app_id = Keyword.get(opts, :app_id, "")

    page_id = Keyword.get(opts, :page_id, "")



    case Config.page_access_token(app_id, page_id) do

      "" -> {:error, %{access_token: "Not found for app_id: #{app_id}, page_id: #{page_id}"}}

      val -> {:ok, val}

    end

  end



  defp continue_with_auth_header(env, next, token) do

    env

    |> Tesla.put_header("Authorization", "Bearer #{token}")

    |> Tesla.run(next)

  end

end