View Source AshAuthentication.Plug behaviour (ash_authentication v4.0.4)

Generate an authentication plug.

Use in your app by creating a new module called AuthPlug or similar:

defmodule MyAppWeb.AuthPlug do
  use AshAuthentication.Plug, otp_app: :my_app

  def handle_success(conn, _activity, user, _token) do
    conn
    |> store_in_session(user)
    |> send_resp(200, "Welcome back #{user.name}")
  end

  def handle_failure(conn, _activity, reason) do
    conn
    |> send_resp(401, "Better luck next time")
  end
end

Using in Phoenix

In your Phoenix router you can add it:

scope "/auth" do
  pipe_through :browser
  forward "/", MyAppWeb.AuthPlug
end

In order to load any authenticated users for either web or API users you can add the following to your router:

import MyAppWeb.AuthPlug

pipeline :session_users do
  plug :load_from_session
end

pipeline :bearer_users do
  plug :load_from_bearer
end

scope "/", MyAppWeb do
  pipe_through [:browser, :session_users]

  live "/", PageLive, :home
end

scope "/api", MyAppWeb do
  pipe_through [:api, :bearer_users]

  get "/" ApiController, :index
end

Using in a Plug application

use Plug.Router

forward "/auth", to: MyAppWeb.AuthPlug

Note that you will need to include a bunch of other plugs in the pipeline to do useful things like session and query param fetching.

Summary

Callbacks

When there is any failure during authentication this callback is called.

When authentication has been succesful, this callback will be called with the conn, the successful activity, the authenticated resource and a token.

Types

@type activity() :: {atom(), atom()}
@type token() :: String.t()

Callbacks

Link to this callback

handle_failure(t, activity, any)

View Source
@callback handle_failure(Plug.Conn.t(), activity(), any()) :: Plug.Conn.t()

When there is any failure during authentication this callback is called.

Note that this includes not just authentication failures but potentially route-not-found errors also.

The default implementation simply returns a 401 status with the message "Access denied". You almost definitely want to override this.

Link to this callback

handle_success(t, activity, arg3, arg4)

View Source
@callback handle_success(
  Plug.Conn.t(),
  activity(),
  Ash.Resource.record() | nil,
  token() | nil
) ::
  Plug.Conn.t()

When authentication has been succesful, this callback will be called with the conn, the successful activity, the authenticated resource and a token.

This allows you to choose what action to take as appropriate for your application.

The default implementation calls store_in_session/2 and returns a simple "Access granted" message to the user. You almost definitely want to override this behaviour.