kmx.io/kmxgit/lib/plug_recaptcha2.ex

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• Hash : 4d8f6ed5
  Author : Thomas de Grivel
  Date : 2022-11-02T18:24:08
  

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• lib/plug_recaptcha2.ex

• ## kmxgit
  ## Copyright 2022 kmx.io <contact@kmx.io>
  ##
  ## Permission is hereby granted to use this software granted
  ## the above copyright notice and this permission paragraph
  ## are included in all copies and substantial portions of this
  ## software.
  ##
  ## THIS SOFTWARE IS PROVIDED "AS-IS" WITHOUT ANY GUARANTEE OF
  ## PURPOSE AND PERFORMANCE. IN NO EVENT WHATSOEVER SHALL THE
  ## AUTHOR BE CONSIDERED LIABLE FOR THE USE AND PERFORMANCE OF
  ## THIS SOFTWARE.
  
  defmodule PlugRecaptcha2 do
    import Plug.Conn
  
    def init(default), do: default
  
    def call(conn, [recaptcha_secret: secret,
                    redirect: redirect]) do
      case conn do
        %Plug.Conn{params: %{"recaptcha" => signature}} ->
          case verify_signature(signature, secret) do
            {:ok} -> conn
            _ -> halt_connection(conn, redirect)
          end
        _ ->
          # IO.puts "no recaptcha param"
          halt_connection(conn, redirect)
      end
    end
    def call(conn, [recaptcha_secret: secret]) do
      call(conn, [recaptcha_secret: secret,
                  redirect: nil])
    end
    def call(_conn, _opts), do: raise "Recaptcha Secret is missing"
  
    defp verify_signature(signature, secret) do
      post_url = "https://www.google.com/recaptcha/api/siteverify?secret=#{secret}&response=#{signature}"
      resp = HTTPoison.post(post_url, "", [{"Content-Type", "application/json"}])
      IO.inspect(recaptcha: resp)
      case resp do
        {:ok, %HTTPoison.Response{status_code: 200, body: body}} ->
          Poison.decode(body)
          |> verify_response
        _ -> {:fail}
      end
    end
  
    defp verify_response({:ok, %{"success" => true}}), do: {:ok}
    defp verify_response(_), do: {:fail}
  
    defp halt_connection(conn, redirect) do
      url = hd(get_req_header(conn, "referer")) || redirect || "/"
      conn
      |> Phoenix.Controller.redirect(external: url)
    end
  end
  

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