poiyzy/bounced_mails_controller.rb

## bounced_mails_controller.rb
class Api::BouncedMailsController < ApplicationController
  skip_before_filter :verify_authenticity_token

  def create
    if verify(ENV["mailgun_api_key"], params[:token], params[:timestamp], params[:signature])
      user = User.find_by_email(params[:recipient])
      if user && params[:event] == "bounced"
        user.lock!
      end
      head(200)
    end
  end

  private
  def verify(api_key, token, timestamp, signature)
    signature == OpenSSL::HMAC.hexdigest(
      OpenSSL::Digest::Digest.new('sha256'),
      api_key,
      '%s%s' % [timestamp, token])
  end
end

## incomming_messages_controller.rb
class Api::IncomingMessagesController < ApplicationController
  skip_before_filter :verify_authenticity_token

  def create
    user = User.where(email: params['sender']).first
    text = params["stripped-text"]
    if user && text.present?
      user.issues.create content: text
    end
    head(200)
  end
end

## mailgun_gateway.rb
class MailgunGateway
  include Rails.application.routes.url_helpers

  def send_batch_message(users)
    RestClient.post(messaging_api_end_point,
    from: "Mailgun Demo <billing@#{ENV["mailgun_domain_name"]}>",
    to: users.map(&:email).join(", "),
    subject: "Monthly Billing Info",
    html: billing_info_text,
    :"h:Reply-To" =>  "billing@#{ENV["mailgun_domain_name"]}",
    :"recipient-variables" => recipient_variables(billing_recipients)
    )
  end

  private

  def api_key
    @api_key ||= ENV["mailgun_api_key"]
  end

  def messaging_api_end_point
    @messaging_api_end_piont ||= "https://api:#{api_key}@api.mailgun.net/v2/#{ENV["mailgun_domain_name"]}/messages"
  end

  def billing_recipients
    @users ||= User.where(locked: false)
  end

  def recipient_variables(recipients)
    vars = recipients.map do |recipient|
      "\"#{recipient.email}\": {\"name\":\"#{recipient.fullname}\"}"
    end
    "{#{vars.join(', ')}}"
  end

  def billing_info_text
<<-EMAIL
<html><body>

Hi %recipient.name%,

<p>
Your bill for the current month is now available, please click on
<br/>
#{billing_url}
<br/>
to see details.
</p>
<p>Reply to this email directly</p>

</body></html>
EMAIL
  end
end

## scheduler.rake
desc "This task is called by the Heroku scheduler add-on"

task :send_billing_info => :environment do
  if DateTime.now.mday == 1
    User.where(locked: false).find_in_batches(batch_size: 1000) do |group|
      MailgunGateway.new.send_batch_message(group)
    end
  end
end

## user.rb
class User < ActiveRecord::Base

  …

  def lock!
    self.locked = true
    save(validate: false)
  end
end
	class Api::BouncedMailsController < ApplicationController
	skip_before_filter :verify_authenticity_token

	def create
	if verify(ENV["mailgun_api_key"], params[:token], params[:timestamp], params[:signature])
	user = User.find_by_email(params[:recipient])
	if user && params[:event] == "bounced"
	user.lock!
	end
	head(200)
	end
	end

	private
	def verify(api_key, token, timestamp, signature)
	signature == OpenSSL::HMAC.hexdigest(
	OpenSSL::Digest::Digest.new('sha256'),
	api_key,
	'%s%s' % [timestamp, token])
	end
	end
	class Api::IncomingMessagesController < ApplicationController
	skip_before_filter :verify_authenticity_token

	def create
	user = User.where(email: params['sender']).first
	text = params["stripped-text"]
	if user && text.present?
	user.issues.create content: text
	end
	head(200)
	end
	end
	class MailgunGateway
	include Rails.application.routes.url_helpers

	def send_batch_message(users)
	RestClient.post(messaging_api_end_point,
	from: "Mailgun Demo <billing@#{ENV["mailgun_domain_name"]}>",
	to: users.map(&:email).join(", "),
	subject: "Monthly Billing Info",
	html: billing_info_text,
	:"h:Reply-To" => "billing@#{ENV["mailgun_domain_name"]}",
	:"recipient-variables" => recipient_variables(billing_recipients)
	)
	end

	private

	def api_key
	@api_key \|\|= ENV["mailgun_api_key"]
	end

	def messaging_api_end_point
	@messaging_api_end_piont \|\|= "https://api:#{api_key}@api.mailgun.net/v2/#{ENV["mailgun_domain_name"]}/messages"
	end

	def billing_recipients
	@users \|\|= User.where(locked: false)
	end

	def recipient_variables(recipients)
	vars = recipients.map do \|recipient\|
	"\"#{recipient.email}\": {\"name\":\"#{recipient.fullname}\"}"
	end
	"{#{vars.join(', ')}}"
	end

	def billing_info_text
	<<-EMAIL
	<html><body>

	Hi %recipient.name%,

	<p>
	Your bill for the current month is now available, please click on
	<br/>
	#{billing_url}
	<br/>
	to see details.
	</p>
	<p>Reply to this email directly</p>

	</body></html>
	EMAIL
	end
	end
	desc "This task is called by the Heroku scheduler add-on"

	task :send_billing_info => :environment do
	if DateTime.now.mday == 1
	User.where(locked: false).find_in_batches(batch_size: 1000) do \|group\|
	MailgunGateway.new.send_batch_message(group)
	end
	end
	end
	class User < ActiveRecord::Base

	…

	def lock!
	self.locked = true
	save(validate: false)
	end
	end