add quilljs, create channel for syncing documents

lib/poex_web/channels/pad_channel.ex

@@ -0,0 +1,28 @@
+defmodule PoexWeb.PadChannel do
+  use Phoenix.Channel
+  alias Poex.Pads.DocumentServer
+
+  @moduledoc """
+  Channel for users of pad documents
+  """
+
+  def join("pad:lobby", _message, socket) do
+    {:ok, socket}
+  end
+
+  def join("pad:" <> document_id, _params, socket) do
+    contents = DocumentServer.get_contents(document_id)
+
+    {:ok, %{uuid: socket.assigns.uuid, contents: contents},
+     assign(socket, :document_id, document_id)}
+  end
+
+  def handle_in("update", %{"change" => change, "client_id" => client_id}, socket) do
+    DocumentServer.update(socket.assigns.document_id, %{
+      "change" => change,
+      "client_id" => client_id
+    })
+
+    {:noreply, socket}
+  end
+end

lib/poex_web/channels/user_socket.ex

@@ -0,0 +1,52 @@
+defmodule PoexWeb.UserSocket do
+  alias Ecto.UUID
+  use Phoenix.Socket
+
+  # A Socket handler
+  #
+  # It's possible to control the websocket connection and
+  # assign values that can be accessed by your channel topics.
+
+  ## Channels
+  channel "pad:*", PoexWeb.PadChannel
+  #
+  # To create a channel file, use the mix task:
+  #
+  #     mix phx.gen.channel Room
+  #
+  # See the [`Channels guide`](https://hexdocs.pm/phoenix/channels.html)
+  # for further details.
+
+  # Socket params are passed from the client and can
+  # be used to verify and authenticate a user. After
+  # verification, you can put default assigns into
+  # the socket that will be set for all channels, ie
+  #
+  #     {:ok, assign(socket, :user_id, verified_user_id)}
+  #
+  # To deny connection, return `:error` or `{:error, term}`. To control the
+  # response the client receives in that case, [define an error handler in the
+  # websocket
+  # configuration](https://hexdocs.pm/phoenix/Phoenix.Endpoint.html#socket/3-websocket-configuration).
+  #
+  # See `Phoenix.Token` documentation for examples in
+  # performing token verification on connect.
+  @impl true
+  def connect(_params, socket, _connect_info) do
+    uuid = UUID.generate()
+    {:ok, assign(socket, :uuid, uuid)}
+  end
+
+  # Socket id's are topics that allow you to identify all sockets for a given user:
+  #
+  #     def id(socket), do: "user_socket:#{socket.assigns.user_id}"
+  #
+  # Would allow you to broadcast a "disconnect" event and terminate
+  # all active sockets and channels for a given user:
+  #
+  #     Elixir.PoexWeb.Endpoint.broadcast("user_socket:#{user.id}", "disconnect", %{})
+  #
+  # Returning `nil` makes this socket anonymous.
+  @impl true
+  def id(_socket), do: nil
+end