cloudflare_turnstile

Add Cloudflare Turnstile to your Rails app in seconds.

Add this line to your Gemfile and then execute bundle install:

gem "cloudflare_turnstile"

Set the following variables in your environment, .env file, or an initializer.

CLOUDFLARE_TURNSTILE_SITE_KEY=""
CLOUDFLARE_TURNSTILE_SECRET_KEY=""

Add the view helper to your form - just before the submit button is usually a good spot.

<%= form_for(@user) do |f| %>
  ..
  <%= cloudflare_turnstile %>
  <%= f.submit "Log In" %>
<% end %>

Then enable it for the controller actions you wish. It works just like a before_action. Pass only: with the action names.

class LoginController < ApplicationController
  cloudflare_turnstile only: [:login_submit]

  def login
  end

  def login_submit
    # Turnstile verification will take place here - prior to code. If it catches a spam bot it will halt it.

    ..
  end
end

When catching a spam bot, it defaults to sending no content with a 200 status code. This way the spam bot will assume it was successful - tricking it.

Inspiration invisible_captcha