1 files changed, 46 insertions, 0 deletions
diff --git a/lib/pleroma/web/chat_channel.ex b/lib/pleroma/web/chat_channel.ex
new file mode 100644
index 000000000..268bef17d
--- /dev/null
+++ b/lib/pleroma/web/chat_channel.ex
@@ -0,0 +1,46 @@
+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
+    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
+    {:noreply, socket}
+  end
+end
+
+defmodule Pleroma.Web.ChatChannel.ChatChannelState do
+  use Agent
+  @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