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Multi-provider support for Pow

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pow_assent lib pow_assent phoenix controllers registration_controller.ex
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lib/pow_assent/phoenix/controllers/registration_controller.ex 

defmodule PowAssent.Phoenix.RegistrationController do

  @moduledoc false

  use Pow.Extension.Phoenix.Controller.Base,

    messages_backend_fallback: PowAssent.Phoenix.Messages



  alias Plug.Conn

  alias PowAssent.Plug

  alias PowEmailConfirmation.Phoenix.ControllerCallbacks



  plug :load_params_from_session

  plug :assign_create_path



  @spec process_add_user_id(Conn.t(), map()) :: {:ok, Conn.t()}

  def process_add_user_id(conn, _params) do

    {:ok, conn}

  end



  @spec respond_add_user_id({:ok, Conn.t()}) :: Conn.t()

  def respond_add_user_id({:ok, conn}) do

    conn

    |> assign(:changeset, Pow.Plug.change_user(conn, %{}))

    |> render("add_user_id.html")

  end



  @spec process_create(Conn.t(), map()) :: {:ok, map(), Conn.t()} | {:error, map(), Conn.t()}

  def process_create(conn, %{"provider" => provider, "user" => user_id_params}) do

    Plug.create_user(conn, provider, conn.private[:pow_assent_params], user_id_params)

  end



  @spec respond_create({:ok, {:new, map()}, Conn.t()}) :: Conn.t()

  def respond_create({:ok, {:new, user}, conn}) do

    conn

    |> maybe_send_confirmation_email(user)

    |> Conn.put_session(:pow_assent_params, nil)

    |> put_flash(:info, messages(conn).user_has_been_created(conn))

    |> redirect(to: routes(conn).after_registration_path(conn))

  end

  @spec respond_create({:error, map(), Conn.t()}) :: Conn.t()

  def respond_create({:error, {:bound_to_different_user, _changeset}, conn}) do

    conn

    |> put_flash(:error, messages(conn).invalid_request(conn))

    |> redirect(to: routes(conn).after_sign_out_path(conn))

  end

  def respond_create({:error, {:invalid_user_id_field, changeset}, conn}),

    do: respond_create({:error, changeset, conn})

  def respond_create({:error, changeset, conn}) do

    conn

    |> assign(:changeset, changeset)

    |> render("add_user_id.html")

  end



  defp load_params_from_session(%{private: %{plug_session: plug_session}} = conn, _opts) do

    case plug_session do

      %{"pow_assent_params" => params} ->

        Conn.put_private(conn, :pow_assent_params, params)



      _ ->

        conn

        |> put_flash(:error, messages(conn).invalid_request(conn))

        |> redirect(to: routes(conn).after_sign_out_path(conn))

        |> halt()

    end

  end



  defp assign_create_path(conn, _opts) do

    path = routes(conn).path_for(conn, __MODULE__, :create, [conn.params["provider"]])

    Conn.assign(conn, :action, path)

  end



  defp maybe_send_confirmation_email(conn, %{email_confirmation_token: token, email_confirmed_at: nil} = user) when not is_nil(token) do

    ControllerCallbacks.send_confirmation_email(user, conn)



    conn

  end

  defp maybe_send_confirmation_email(conn, _user), do: conn

end