Rails 3 Controller for Chargify Webhooks

hooks_controller.rb

require 'digest/md5'

class Chargify::HooksController < ApplicationController
	protect_from_forgery :except => :dispatch_handler
	before_filter :verify, :only => :dispatch_handler

	EVENTS = %w[ test signup_success signup_failure renewal_success renewal_failure payment_success payment_failure billing_date_change subscription_state_change subscription_product_change ].freeze

	def dispatch_handler
		event = params[:event]

		unless EVENTS.include? event
		  render :nothing => true, :status => 404 and return
		end

		begin
			convert_payload
			self.send event
		rescue Exception => e
			notify_hoptoad(e) #If you use hoptoad...
		  render :nothing => true, :status => 422 and return
		end
	end

	def test
		Rails.logger.debug "Chargify Webhook test!"
		  render :nothing => true, :status => 200
	end

	def signup_success
		  render :nothing => true, :status => 200
	end

	def signup_failure
		  render :nothing => true, :status => 200
	end

	def renewal_success
		  render :nothing => true, :status => 200
	end

	def renewal_failure
		  render :nothing => true, :status => 200
	end

	def payment_success
		  render :nothing => true, :status => 200
	end

	def payment_failure
		  render :nothing => true, :status => 200
	end

	def billing_date_change
		  render :nothing => true, :status => 200
	end

	def subscription_state_change
		  render :nothing => true, :status => 200
	end

	def subscription_product_change
		  render :nothing => true, :status => 200
	end

	protected
	def verify
		if params[:signature].nil?
			params[:signature] = request.headers["HTTP_X_CHARGIFY_WEBHOOK_SIGNATURE"]
		end


		unless Digest::MD5::hexdigest(ENV['CHARGIFY_SUBDOMAIN_SHARED_KEY'] + request.raw_post) == params[:signature]
		  render :nothing => true, :status => :forbidden
		end
	end

	def convert_payload
		if params[:payload].has_key? :transaction
			@transaction = Chargify::Transaction.new params[:payload][:transaction]
		end

		if params[:payload].has_key? :subscription
			@subscription = Chargify::Subscription.new params[:payload][:subscription]
		end
	end
end

# to put in the routes.rb file...
#  namespace 'chargify' do
#    match '/hooks' => "hooks#dispatch_handler", :via => "post"
#  end

This fork fixes a few issues I experienced using rails 3.

• Changed the required 'md5' to 'digest/md5'
• changed the 'render :nothing' to 'render :nothing => true' throughout
• changed the dispatch method to dispatch_handler due to naming conflict
• updated the route to rails 3 format, also changed the action to match my above change.

To put context on how to use this. Create this controller in a "chargify" sub-folder under controllers. Add the route that is commented out at the bottom to your routes file. Then in your chargify web ui, under settings and webhooks, specify the address as http://www.yoursite.com/chargify/hooks

That is all that is required. If you want to test this in your dev machine, I recommend the https://showoff.io tool to expose your localmachine to the web, it works very well for testing these webhooks.

Also I had to change "MD5::hexdigest" to "Digest::MD5.hexdigest"