Exrecaptcha

Simple ReCaptcha display/verify code for Elixir applications. Using Exrecaptcha with a CMS such as Phoenix is easy.

Installation

Set as a dep in your mix.exs and ensure it is running with your app:

  def application do
    [
      # ...
      applications: [:phoenix, :cowboy, :logger, :exrecaptcha]
      # ...
    ]
  end

  defp deps do
    [
      {:phoenix, "0.5.0"},
      {:cowboy, "~> 1.0.0"},
      #...
      {:ibrowse, github: "cmullaparthi/ibrowse", tag: "v4.1.0"},
      {:exrecaptcha, "~> 0.0.3"}
    ]
  end

And fetch your project's dependencies:

$ mix deps.get

Config

In your application's config.exs :

config :exrecaptcha,
  api_config: %{ verify_url: "http://www.google.com/recaptcha/api/verify",
                 public_key: "YOUR_PUBLIC_KEY",
                 private_key: "YOUR_PRIVATE_KEY" }

You can use https instead of http for the verify_url.

Usage

View

Put this code somewhere in your html template:

<form id="loginForm" name="newuser" method="post" action="/users">
  ...
  <%= safe Exrecaptcha.display %>
  ...
</form>

Controller

Provided you've set the routing properly, you just have to call

# your post method should route you here:
def create(conn, params) do
  # do stuff, then check for the validity of the captcha
  :ok = verify_captcha(conn, params)
end

defp verify_captcha(conn, %{"recaptcha_challenge_field" => challenge,
                            "recaptcha_response_field" => response}) do
  remote_ip = conn.remote_ip
  Exrecaptcha.verify(remote_ip, challenge, response)
end

##TODO

No option for recaptcha display can be set yet
Error handling is quite inexistent (throws RuntimeError)
No tests

Changelog

0.0.3: Update HTTPotion dependency, avoiding elixir version warnings
0.0.2: Use HTTPS by default
0.0.1: Initial release

Licensing

Copyright © 2014 Adrien Anselme and contributors This work is free. You can redistribute it and/or modify it under the terms of the Do What The Fuck You Want To Public License, Version 2, as published by Sam Hocevar. See the COPYING file for more details.

adanselm/exrecaptcha