phoenix_kit

1.7.4

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A foundation for building Elixir Phoenix apps — SaaS, social networks, ERP systems, marketplaces, and more

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phoenix_kit lib phoenix_kit_web users magic_link_registration.ex

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lib/phoenix_kit_web/users/magic_link_registration.ex

defmodule PhoenixKitWeb.Users.MagicLinkRegistration do
  @moduledoc """
  LiveView for magic link registration completion form.
  """

  use PhoenixKitWeb, :live_view

  alias PhoenixKit.ReferralCodes
  alias PhoenixKit.Users.Auth
  alias PhoenixKit.Users.Auth.User
  alias PhoenixKit.Users.MagicLinkRegistration
  alias PhoenixKit.Utils.Routes

  @impl true
  def mount(%{"token" => token}, _session, socket) do
    case MagicLinkRegistration.verify_registration_token(token) do
      {:ok, email} ->
        # Get referral codes configuration
        referral_codes_config = ReferralCodes.get_config()

        # Generate username suggestion from email
        suggested_username = User.generate_username_from_email(email)

        changeset =
          Auth.change_user_registration(%User{
            email: email,
            username: suggested_username
          })

        # Extract IP address for geolocation
        ip_address =
          case get_connect_info(socket, :peer_data) do
            %{address: {a, b, c, d}} -> "#{a}.#{b}.#{c}.#{d}"
            %{address: address} -> to_string(address)
            _ -> "unknown"
          end

        {:ok,
         socket
         |> assign(:page_title, "Complete Registration")
         |> assign(:token, token)
         |> assign(:email, email)
         |> assign(:ip_address, ip_address)
         |> assign(:referral_codes_enabled, referral_codes_config.enabled)
         |> assign(:referral_codes_required, referral_codes_config.required)
         |> assign(:referral_code, nil)
         |> assign(:referral_code_error, nil)
         |> assign(:trigger_submit, false)
         |> assign(:check_errors, false)
         |> assign_form(changeset)}

      {:error, _} ->
        {:ok,
         socket
         |> put_flash(:error, "Registration link is invalid or has expired.")
         |> redirect(to: Routes.path("/users/register"))}
    end
  end

  @impl true
  def handle_event("validate", %{"user" => user_params} = params, socket) do
    referral_code = params["referral_code"]

    case validate_referral_code(referral_code, socket) do
      {:ok, _} ->
        socket =
          socket
          |> assign(referral_code: referral_code)
          |> assign(referral_code_error: nil)

        changeset =
          %User{email: socket.assigns.email}
          |> Auth.change_user_registration(user_params)
          |> Map.put(:action, :validate)

        {:noreply, assign_form(socket, changeset)}

      {:error, error_message} ->
        socket =
          socket
          |> assign(referral_code: referral_code)
          |> assign(referral_code_error: error_message)

        changeset =
          %User{email: socket.assigns.email}
          |> Auth.change_user_registration(user_params)
          |> Map.put(:action, :validate)

        {:noreply, assign_form(socket, changeset)}
    end
  end

  @impl true
  def handle_event("save", %{"user" => user_params} = params, socket) do
    referral_code = params["referral_code"]

    case validate_referral_code(referral_code, socket) do
      {:ok, _validated_code} ->
        # Add referral_code to user params
        user_params =
          if referral_code && String.trim(referral_code) != "" do
            Map.put(user_params, "referral_code", referral_code)
          else
            user_params
          end

        # Complete registration
        case MagicLinkRegistration.complete_registration(
               socket.assigns.token,
               user_params,
               socket.assigns.ip_address
             ) do
          {:ok, user} ->
            changeset = Auth.change_user_registration(user)
            {:noreply, socket |> assign(trigger_submit: true) |> assign_form(changeset)}

          {:error, %Ecto.Changeset{} = changeset} ->
            {:noreply, socket |> assign(check_errors: true) |> assign_form(changeset)}
        end

      {:error, error_message} ->
        socket =
          socket
          |> assign(referral_code: referral_code)
          |> assign(referral_code_error: error_message)
          |> assign(check_errors: true)

        {:noreply, socket}
    end
  end

  defp assign_form(socket, %Ecto.Changeset{} = changeset) do
    form = to_form(changeset, as: "user")

    if changeset.valid? do
      assign(socket, form: form, check_errors: false)
    else
      assign(socket, form: form)
    end
  end

  defp validate_referral_code(referral_code, socket) do
    cond do
      not socket.assigns.referral_codes_enabled ->
        {:ok, nil}

      socket.assigns.referral_codes_required and
          (is_nil(referral_code) or String.trim(referral_code) == "") ->
        {:error, "Referral code is required"}

      referral_code && String.trim(referral_code) != "" ->
        validate_referral_code_value(String.trim(referral_code))

      true ->
        {:ok, nil}
    end
  end

  defp validate_referral_code_value(code_string) do
    case ReferralCodes.get_code_by_string(code_string) do
      nil ->
        {:error, "Invalid referral code"}

      code ->
        cond do
          not code.status ->
            {:error, "This referral code is no longer active"}

          ReferralCodes.expired?(code) ->
            {:error, "This referral code has expired"}

          ReferralCodes.usage_limit_reached?(code) ->
            {:error, "This referral code has reached its usage limit"}

          true ->
            {:ok, code}
        end
    end
  end
end

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