welcome_message.ex
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welcome_message.ex
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	# Pleroma: A lightweight social networking server
	# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
	# SPDX-License-Identifier: AGPL-3.0-only

	defmodule Pleroma.User.WelcomeMessage do
	alias Pleroma.Config
	alias Pleroma.User
	alias Pleroma.Web.CommonAPI

	@spec enabled?() :: boolean()
	def enabled?, do: Config.get([:welcome, :direct_message, :enabled], false)

	@spec post_message(User.t()) :: {:ok, Pleroma.Activity.t() \| nil}
	def post_message(user) do
	[:welcome, :direct_message, :sender_nickname]
	\|> Config.get(nil)
	\|> fetch_sender()
	\|> do_post(user, welcome_message())
	end

	defp do_post(%User{} = sender, %User{nickname: nickname}, message)
	when is_binary(message) do
	CommonAPI.post(
	sender,
	%{
	visibility: "direct",
	status: "@#{nickname}\n#{message}"
	}
	)
	end

	defp do_post(_sender, _recipient, _message), do: {:ok, nil}

	defp fetch_sender(nickname) when is_binary(nickname) do
	with %User{local: true} = user <- User.get_cached_by_nickname(nickname) do
	user
	else
	_ -> nil
	end
	end

	defp fetch_sender(_), do: nil

	defp welcome_message do
	Config.get([:welcome, :direct_message, :message], nil)
	end
	end