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Robust user authentication solution

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pow lib pow phoenix controllers registration_controller.ex
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lib/pow/phoenix/controllers/registration_controller.ex 

defmodule Pow.Phoenix.RegistrationController do

  @moduledoc false

  use Pow.Phoenix.Controller



  alias Plug.Conn

  alias Pow.Plug



  plug :require_not_authenticated when action in [:new, :create]

  plug :require_authenticated when action in [:edit, :update, :delete]

  plug :assign_create_path when action in [:new, :create]

  plug :assign_update_path when action in [:edit, :update]

  plug :put_no_cache_header when action in [:new]



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

  def process_new(conn, _params) do

    {:ok, Plug.change_user(conn), conn}

  end



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

  def respond_new({:ok, changeset, conn}) do

    conn

    |> assign(:changeset, changeset)

    |> render("new.html")

  end



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

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

    Plug.create_user(conn, user_params)

  end



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

  def respond_create({:ok, _user, conn}) do

    conn

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

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

  end

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

    conn

    |> assign(:changeset, changeset)

    |> render("new.html")

  end



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

  def process_edit(conn, _params) do

    {:ok, Plug.change_user(conn), conn}

  end



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

  def respond_edit({:ok, changeset, conn}) do

    conn

    |> assign(:changeset, changeset)

    |> render("edit.html")

  end



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

  def process_update(conn, %{"user" => user_params}) do

    Plug.update_user(conn, user_params)

  end



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

  def respond_update({:ok, _user, conn}) do

    conn

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

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

  end

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

    conn

    |> assign(:changeset, changeset)

    |> render("edit.html")

  end



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

  def process_delete(conn, _params) do

    Plug.delete_user(conn)

  end



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

  def respond_delete({:ok, _user, conn}) do

    conn

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

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

  end

  def respond_delete({:error, _changeset, conn}) do

    conn

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

    |> redirect(to: routes(conn).path_for(conn, __MODULE__, :edit))

  end



  defp assign_create_path(conn, _opts) do

    path = routes(conn).path_for(conn, __MODULE__, :create)

    Conn.assign(conn, :action, path)

  end



  defp assign_update_path(conn, _opts) do

    path = routes(conn).path_for(conn, __MODULE__, :update)

    Conn.assign(conn, :action, path)

  end

end