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Robust user authentication solution

Security advisory: This version has known vulnerabilities. View advisories
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pow lib extensions email_confirmation phoenix controllers confirmation_controller.ex
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lib/extensions/email_confirmation/phoenix/controllers/confirmation_controller.ex 

defmodule PowEmailConfirmation.Phoenix.ConfirmationController do

  @moduledoc false

  use Pow.Extension.Phoenix.Controller.Base



  alias Plug.Conn

  alias PowEmailConfirmation.Plug



  plug :load_user_from_confirmation_token when action in [:show]



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

  def process_show(conn, _params), do: Plug.confirm_email(conn, %{})



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

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

    conn

    |> put_flash(:info, extension_messages(conn).email_has_been_confirmed(conn))

    |> redirect(to: redirect_to(conn))

  end

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

    conn

    |> put_flash(:error, extension_messages(conn).email_confirmation_failed(conn))

    |> redirect(to: redirect_to(conn))

  end



  defp redirect_to(conn) do

    case Pow.Plug.current_user(conn) do

      nil   -> routes(conn).session_path(conn, :new)

      _user -> routes(conn).registration_path(conn, :edit)

    end

  end



  defp load_user_from_confirmation_token(%{params: %{"id" => token}} = conn, _opts) do

    case Plug.load_user_by_token(conn, token) do

      {:error, conn} ->

        conn

        |> put_flash(:error, extension_messages(conn).invalid_token(conn))

        |> redirect(to: redirect_to(conn))

        |> halt()



      {:ok, conn} ->

        conn

    end

  end

end