60 lines
1.7 KiB
Elixir
60 lines
1.7 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Web.ShoutChannel do
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use Phoenix.Channel
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alias Pleroma.User
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alias Pleroma.Web.MastodonAPI.AccountView
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alias Pleroma.Web.ShoutChannel.ShoutChannelState
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def join("chat:public", _message, socket) do
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send(self(), :after_join)
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{:ok, socket}
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end
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def handle_info(:after_join, socket) do
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push(socket, "messages", %{messages: ShoutChannelState.messages()})
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{:noreply, socket}
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end
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def handle_in("new_msg", %{"text" => text}, %{assigns: %{user_name: user_name}} = socket) do
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text = String.trim(text)
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if String.length(text) in 1..Pleroma.Config.get([:shout, :limit]) do
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author = User.get_cached_by_nickname(user_name)
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author_json = AccountView.render("show.json", user: author, skip_visibility_check: true)
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message = ShoutChannelState.add_message(%{text: text, author: author_json})
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broadcast!(socket, "new_msg", message)
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end
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{:noreply, socket}
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end
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end
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defmodule Pleroma.Web.ShoutChannel.ShoutChannelState do
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use Agent
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@max_messages 20
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def start_link(_) do
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Agent.start_link(fn -> %{max_id: 1, messages: []} end, name: __MODULE__)
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end
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def add_message(message) do
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Agent.get_and_update(__MODULE__, fn state ->
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id = state[:max_id] + 1
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message = Map.put(message, "id", id)
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messages = [message | state[:messages]] |> Enum.take(@max_messages)
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{message, %{max_id: id, messages: messages}}
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end)
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end
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def messages do
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Agent.get(__MODULE__, fn state -> state[:messages] |> Enum.reverse() end)
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end
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end
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