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# Pleroma: A lightweight social networking server
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.ChatChannel do
use Phoenix.Channel
alias Pleroma.Web.ChatChannel.ChatChannelState
alias Pleroma.User
def join("chat:public", _message, socket) do
send(self(), :after_join)
{:ok, socket}
end
def handle_info(:after_join, socket) do
push(socket, "messages", %{messages: ChatChannelState.messages()})
{:noreply, socket}
end
def handle_in("new_msg", %{"text" => text}, %{assigns: %{user_name: user_name}} = socket) do
text = String.trim(text)
if String.length(text) > 0 do
author = User.get_cached_by_nickname(user_name)
author = Pleroma.Web.MastodonAPI.AccountView.render("account.json", user: author)
message = ChatChannelState.add_message(%{text: text, author: author})
broadcast!(socket, "new_msg", message)
end
{:noreply, socket}
end
end
defmodule Pleroma.Web.ChatChannel.ChatChannelState do
@max_messages 20
def start_link do
Agent.start_link(fn -> %{max_id: 1, messages: []} end, name: __MODULE__)
end
def add_message(message) do
Agent.get_and_update(__MODULE__, fn state ->
id = state[:max_id] + 1
message = Map.put(message, "id", id)
messages = [message | state[:messages]] |> Enum.take(@max_messages)
{message, %{max_id: id, messages: messages}}
end)
end
def messages() do
Agent.get(__MODULE__, fn state -> state[:messages] |> Enum.reverse() end)
end
end
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