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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.Web.ShoutChannel do
   6   use Phoenix.Channel
   7
   8   alias Pleroma.User
   9   alias Pleroma.Web.MastodonAPI.AccountView
  10   alias Pleroma.Web.ShoutChannel.ShoutChannelState
  11
  12   def join("chat:public", _message, socket) do
  13     send(self(), :after_join)
  14     {:ok, socket}
  15   end
  16
  17   def handle_info(:after_join, socket) do
  18     push(socket, "messages", %{messages: ShoutChannelState.messages()})
  19     {:noreply, socket}
  20   end
  21
  22   def handle_in("new_msg", %{"text" => text}, %{assigns: %{user_name: user_name}} = socket) do
  23     text = String.trim(text)
  24
  25     if String.length(text) in 1..Pleroma.Config.get([:shout, :limit]) do
  26       author = User.get_cached_by_nickname(user_name)
  27       author_json = AccountView.render("show.json", user: author, skip_visibility_check: true)
  28
  29       message = ShoutChannelState.add_message(%{text: text, author: author_json})
  30
  31       broadcast!(socket, "new_msg", message)
  32     end
  33
  34     {:noreply, socket}
  35   end
  36 end
  37
  38 defmodule Pleroma.Web.ShoutChannel.ShoutChannelState do
  39   use Agent
  40
  41   @max_messages 20
  42
  43   def start_link(_) do
  44     Agent.start_link(fn -> %{max_id: 1, messages: []} end, name: __MODULE__)
  45   end
  46
  47   def add_message(message) do
  48     Agent.get_and_update(__MODULE__, fn state ->
  49       id = state[:max_id] + 1
  50       message = Map.put(message, "id", id)
  51       messages = [message | state[:messages]] |> Enum.take(@max_messages)
  52       {message, %{max_id: id, messages: messages}}
  53     end)
  54   end
  55
  56   def messages do
  57     Agent.get(__MODULE__, fn state -> state[:messages] |> Enum.reverse() end)
  58   end
  59 end