Twilio Request Validation for Rails

twilio_base_controller.rb

class TwilioBaseController < ActionController::Base
  before_filter :authenticate_twilio_request

private
  def authenticate_twilio_request
    twilio_sig = request.headers['HTTP_X_TWILIO_SIGNATURE']
    render :xml => (Twilio::TwiML::Response.new {|r| r.Hangup}).text and return if twilio_sig.blank?

    twilio_validator = Twilio::Util::RequestValidator.new("YOUR TWILIO AUTH TOKEN")
    params_for_auth  = (request.post? ? env['rack.request.form_hash'] : {})
    uri_for_auth     = request.original_url

    is_valid_twilio_req = twilio_validator.validate(uri_for_auth, params_for_auth, twilio_sig)

    unless is_valid_twilio_req
      render :xml => (Twilio::TwiML::Response.new {|r| r.Hangup}).text
      false
    end
  end

end