GoogleRecaptcha Ruby

recaptcha.rb

# https://developers.google.com/recaptcha/docs/verify

# app/controllers/application_controller.rb
  def recaptcha_valid?
    recaptcha_response = params['g-recaptcha-response']
    return false unless recaptcha_response
    GoogleRecaptcha.new.verify_recaptcha(response: recaptcha_response, remoteip: request.remote_ip)
  rescue
    false
  end

# lib/google_recaptcha.rb
class GoogleRecaptcha
  BASE_URL   = "https://www.google.com/".freeze
  VERIFY_URL = "recaptcha/api/siteverify".freeze

  def initialize
    @client = Faraday.new(BASE_URL)
  end

  def verify_recaptcha(params)
    response = perform_verify_request(params)
    success?(response)
  end

  def success?(response)
    JSON.parse(response.body)["success"]
  end

  private

  attr_reader :client

  def perform_verify_request(params)
    client.post(VERIFY_URL) do |req|
      req.params = params.merge(secret: ENV['RECAPTCHA_SECRET_KEY'])
    end
  end
end