Phoenix socket/channels security / IP identification

Phoenix Forum Questions / Help
4

Phoenix 1.4 update:

Since Phoenix 1.4, you can get connection information from the underlying transport. What kind of information you get is transport dependent, but with the WebSocket transport it is possible to retrieve the peer info (ip address) and a list of x- headers (for x-forwarded-for resolving).

Configure your socket like this in your endpoint.ex:

  socket("/socket", MyApp.Web.UserSocket,
    websocket: [connect_info: [:peer_data, :x_headers]],
    longpoll: [connect_info: [:peer_data, :x_headers]]
  )

And then your UserSocket module must expose a connect/3 function like this:

  def connect(_params, socket, connect_info) do
    {:ok, socket}
  end

On connect, the connect_info parameter now contains info from the transport:

info: %{
  peer_data: %{address: {127, 0, 0, 1}, port: 52372, ssl_cert: nil},
  x_headers: []
}
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