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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.User.WelcomeMessage do
   6   alias Pleroma.Config
   7   alias Pleroma.User
   8   alias Pleroma.Web.CommonAPI
   9
  10   @spec enabled?() :: boolean()
  11   def enabled?, do: Config.get([:welcome, :direct_message, :enabled], false)
  12
  13   @spec post_message(User.t()) :: {:ok, Pleroma.Activity.t() | nil}
  14   def post_message(user) do
  15     [:welcome, :direct_message, :sender_nickname]
  16     |> Config.get(nil)
  17     |> fetch_sender()
  18     |> do_post(user, welcome_message())
  19   end
  20
  21   defp do_post(%User{} = sender, %User{nickname: nickname}, message)
  22        when is_binary(message) do
  23     CommonAPI.post(
  24       sender,
  25       %{
  26         visibility: "direct",
  27         status: "@#{nickname}\n#{message}"
  28       }
  29     )
  30   end
  31
  32   defp do_post(_sender, _recipient, _message), do: {:ok, nil}
  33
  34   defp fetch_sender(nickname) when is_binary(nickname) do
  35     with %User{local: true} = user <- User.get_cached_by_nickname(nickname) do
  36       user
  37     else
  38       _ -> nil
  39     end
  40   end
  41
  42   defp fetch_sender(_), do: nil
  43
  44   defp welcome_message do
  45     Config.get([:welcome, :direct_message, :message], nil)
  46   end
  47 end