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Robust user authentication solution

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pow lib pow phoenix template.ex
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lib/pow/phoenix/template.ex 

defmodule Pow.Phoenix.Template do

  @moduledoc """

  Module that can builds templates for Phoenix views using EEx with

  `Phoenix.HTML.Engine`.



  ## Example



      defmodule MyApp.ResourceTemplate do

        use Pow.Phoenix.Template



        template :new, :html, "<%= content_tag(:span, "Template") %>"

      end



      MyApp.ResourceTemplate.render("new.html", assigns)

  """



  @doc false

  defmacro __using__(_opts) do

    quote do

      import unquote(__MODULE__)



      import Pow.Phoenix.HTML.ErrorHelpers, only: [error_tag: 2]

      import Phoenix.HTML.{Form, Link}



      alias Pow.Phoenix.Router.Helpers, as: Routes

    end

  end



  @doc """

  Generates template methods.



  This macro that will compile a phoenix view template from the provided

  binary, and add the compiled version to a `render/2` method. The `html/1`

  method outputs the binary.

  """

  @spec template(atom(), atom(), binary() | {atom(), any()}) :: Macro.t()

  defmacro template(action, :html, content) do

    content = EEx.eval_string(content)

    render_html_template(action, content)

  end



  defp render_html_template(action, content) do

    quoted = EEx.compile_string(content, engine: Phoenix.HTML.Engine, line: 1, trim: true)



    quote do

      def render(unquote("#{action}.html"), var!(assigns)) do

        _ = var!(assigns)

        unquote(quoted)

      end



      def html(unquote(action)), do: unquote(content)

    end

  end

end