Ash Elixir•3y ago

require authenticated user

Hi,Im still new to elixir and phoenix. I'm using ash_authentication_phoenix. i want to redirect user after sign-in to "/dashboard" and prevent unsigned user from the route. I read the doc but I cant figure it.

14 Replies

ZachDaniel•3y ago

in ash_hq we use this:

defmodule AshHqWeb.LiveUserAuth do
  @moduledoc """
  Helpers for authenticating users in liveviews
  """

  import Phoenix.Component
  use AshHqWeb, :verified_routes

  def on_mount(:live_user_optional, _params, _session, socket) do
    if socket.assigns[:current_user] do
      {:cont, socket}
    else
      {:cont, assign(socket, :current_user, nil)}
    end
  end

  def on_mount(:live_user_required, _params, _session, socket) do
    if socket.assigns[:current_user] do
      {:cont, socket}
    else
      {:halt, Phoenix.LiveView.redirect(socket, to: ~p"/sign-in")}
    end
  end
end

defmodule AshHqWeb.LiveUserAuth do
  @moduledoc """
  Helpers for authenticating users in liveviews
  """

  import Phoenix.Component
  use AshHqWeb, :verified_routes

  def on_mount(:live_user_optional, _params, _session, socket) do
    if socket.assigns[:current_user] do
      {:cont, socket}
    else
      {:cont, assign(socket, :current_user, nil)}
    end
  end

  def on_mount(:live_user_required, _params, _session, socket) do
    if socket.assigns[:current_user] do
      {:cont, socket}
    else
      {:halt, Phoenix.LiveView.redirect(socket, to: ~p"/sign-in")}
    end
  end
end

And then we do this kind of thing:

    ash_authentication_live_session :authenticated_only,
      on_mount: [
        {AshHqWeb.InitAssigns, :default},
        {AshHqWeb.LiveUserAuth, :live_user_required}
      ],
      session: {AshAuthentication.Phoenix.LiveSession, :generate_session, []},
      root_layout: {AshHqWeb.LayoutView, :root} do
      live("/users/settings", AppViewLive, :user_settings)
    end

    ash_authentication_live_session :authenticated_only,
      on_mount: [
        {AshHqWeb.InitAssigns, :default},
        {AshHqWeb.LiveUserAuth, :live_user_required}
      ],
      session: {AshAuthentication.Phoenix.LiveSession, :generate_session, []},
      root_layout: {AshHqWeb.LayoutView, :root} do
      live("/users/settings", AppViewLive, :user_settings)
    end

This is what you'd do for liveviews For regular views/controllers you'd use a plug.

icecarrotbearOP•3y ago

Thanks you so much.it work..I did not aware ash-hq web on github.

ZachDaniel•3y ago

Yep! That can be a great place to look for example code.

brittonjb•3y ago

As an aside here Zach, might be worth compiling a few example repos into a guide on the Ash primary repo docs folder, between real world, twitter, and ash hq you can usually find what you need.

ZachDaniel•3y ago

Good point. We have a link to repos (not including realworld because that is new) in the Media page, but adding them to the sidebar would be cool

dungnguyen8134•3y ago

I copy code from ash_hq and it doesn't load current user

live_session :authenticated_only,
      on_mount: [
        {OrangeCmsWeb.LiveUserAuth, :live_user_required}
      ],
      session: {AshAuthentication.Phoenix.LiveSession, :generate_session, []} do
      
      scope "/" do
        live "/p", ProjectLive.Index, :index
      end
    end

live_session :authenticated_only,
      on_mount: [
        {OrangeCmsWeb.LiveUserAuth, :live_user_required}
      ],
      session: {AshAuthentication.Phoenix.LiveSession, :generate_session, []} do
      
      scope "/" do
        live "/p", ProjectLive.Index, :index
      end
    end

then I replace live_session with ash_authentication_live_session and I got this compile error

== Compilation error in file lib/orange_cms_web/router.ex ==
** (ArgumentError) invalid live_session :session

expected a map with string keys or an MFA tuple, got [{AshAuthentication.Phoenix.LiveSession, :generate_session, [nil]}, {AshAuthentication.Phoenix.LiveSession, :generate_session, []}]

    (phoenix_live_view 0.18.16) lib/phoenix_live_view/router.ex:255: anonymous fn/3 in Phoenix.LiveView.Router.validate_live_session_opts/3
    (elixir 1.14.3) lib/enum.ex:2468: Enum."-reduce/3-lists^foldl/2-0-"/3
    (phoenix_live_view 0.18.16) lib/phoenix_live_view/router.ex:226: Phoenix.LiveView.Router.__live_session__/3
    lib/orange_cms_web/router.ex:52: (module)
    (elixir 1.14.3) lib/kernel/parallel_compiler.ex:340: anonymous fn/5 in Kernel.ParallelCompiler.spawn_workers/7

== Compilation error in file lib/orange_cms_web/router.ex ==
** (ArgumentError) invalid live_session :session

expected a map with string keys or an MFA tuple, got [{AshAuthentication.Phoenix.LiveSession, :generate_session, [nil]}, {AshAuthentication.Phoenix.LiveSession, :generate_session, []}]

    (phoenix_live_view 0.18.16) lib/phoenix_live_view/router.ex:255: anonymous fn/3 in Phoenix.LiveView.Router.validate_live_session_opts/3
    (elixir 1.14.3) lib/enum.ex:2468: Enum."-reduce/3-lists^foldl/2-0-"/3
    (phoenix_live_view 0.18.16) lib/phoenix_live_view/router.ex:226: Phoenix.LiveView.Router.__live_session__/3
    lib/orange_cms_web/router.ex:52: (module)
    (elixir 1.14.3) lib/kernel/parallel_compiler.ex:340: anonymous fn/5 in Kernel.ParallelCompiler.spawn_workers/7

finally I remove the :session options and it works

ash_authentication_live_session :authenticated_only,
      on_mount: [
        {OrangeCmsWeb.LiveUserAuth, :live_user_required}
      ] do
      scope "/" do
        live "/p", ProjectLive.Index, :index
      end
    end

ash_authentication_live_session :authenticated_only,
      on_mount: [
        {OrangeCmsWeb.LiveUserAuth, :live_user_required}
      ] do
      scope "/" do
        live "/p", ProjectLive.Index, :index
      end
    end

ZachDaniel•3y ago

🤔 Ah, yeah, that is a bug but your solution is correct There apparently has to be only one session hook

dungnguyen8134•3y ago

I think we should add this to AshAuthentication.Phoenix tutorial

ZachDaniel•3y ago

Does it not show using ash_authentication_live_session in that tutorial? Can you show me where its missing? Happy to fix

dungnguyen8134•3y ago

No I cannot find in the tutorial

ZachDaniel•3y ago

I will add a liveview specific tutorial and link to it from the end of the getting started guide 😄

ZachDaniel•3y ago

https://github.com/team-alembic/ash_authentication_phoenix/blob/main/documentation/tutorials/use-ash-authentication-with-liveview.md

GitHub

ash_authentication_phoenix/use-ash-authentication-with-liveview.md ...

Drop-in authentication support for Phoenix apps using AshAuthentication. - ash_authentication_phoenix/use-ash-authentication-with-liveview.md at main · team-alembic/ash_authentication_phoenix

ZachDaniel•3y ago

This will be on ash HQ in the next release

dungnguyen8134•3y ago

That's great, thank you

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