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This is a plug to ensure a session has an id…

defmodule KokoWeb.Plugs.EnsureSessionId do
  @moduledoc """
  Add a session_id to conn and session
  """
  import Plug.Conn

  def init(opts), do: opts

  def call(conn, _opts) do
    case get_session(conn, :session_id) do
      nil ->
        session_id = Ecto.UUID.generate()

        conn
        |> put_session(:session_id, session_id)
        |> assign(:session_id, session_id)

      session_id ->
        conn
        |> assign(:session_id, session_id)
    end
  end
end
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