Plug pipeline middleware support for Nex applications.

Allows users to declare a list of Plugs that run on every request before the framework's own routing logic. Useful for authentication, logging, request rate limiting, and other cross-cutting concerns.

Configuration

In your application.ex or mix.exs config:

# application.ex
def start(_type, _args) do
  Application.put_env(:nex_core, :plugs, [
    MyApp.Plugs.Auth,
    MyApp.Plugs.RequestLogger
  ])
  # ...
end

Writing a Plug

defmodule MyApp.Plugs.Auth do
  import Plug.Conn

  def init(opts), do: opts

  def call(conn, _opts) do
    session_user = Nex.Session.get(:user_id)

    if session_user do
      conn
    else
      conn
      |> put_resp_header("location", "/login")
      |> send_resp(302, "")
      |> halt()
    end
  end
end

Path-scoped Middleware

To apply a plug only to certain paths, check conn.path_info inside the plug:

def call(conn, _opts) do
  if List.starts_with?(conn.path_info, ["admin"]) do
    # apply auth check
  else
    conn
  end
end