Rack with mail on heroku sample

simple_rack_mail.rb

require 'json'
require 'mail'

Mail.defaults do
  delivery_method :smtp, 
   {  address:  "smtp.sendgrid.net",
      port: 587,
      domain: 'heroku.com',
      user_name: ENV['SENDGRID_USERNAME'],
      password: ENV['SENDGRID_PASSWORD'],
      authentication: 'plain',
      enable_starttls_auto: true }
end

class MailCarrier
  attr_accessor :name, :email, :subject, :message, :to

  class InvalidParams < StandardError; end
  
  def initialize params
    raise InvalidParams, "for God sake" if params['email'] == ""
    self.to = "your@email.com"
    self.subject = "Contacto Subject"
    self.name = params['name']
    self.email = params['email']
    self.message = params['message']
  end

  # trash
  def compose
    body = <<END_OF_MESSAGE
      From: #{self.name} <#{self.email}>
      To: Inovv <#{self.to}>
      Subject: #{self.subject}
      MIME-Version: 1.0
      Content-Type: text/plain
      Date: #{Time.now}

      #{self.message}
END_OF_MESSAGE
  end

  def deliver
    mail = self
    begin
      Mail.deliver do
        to mail.to
        from "#{mail.name} <#{mail.email}>"
        subject "#{mail.subject}"
        text_part do
          body "#{mail.message}"
        end
      end
      # old
      # require 'net/smtp'
      # Net::SMTP.start('smtp.sendgrid.net'], 587, 'heroku.com', ENV['SENDGRID_USERNAME'], ENV['SENDGRID_PASSWORD'], :plain) do |smtp|
      #   smtp.sendmail self.message, self.email, self.to
      # end
    rescue => e  
      raise "Troll: #{e} "
    end  
  end

  private
 
  # trash
  # sendgrid api
  def json
    # "to=#{self.to}&toname=#{self.name}&subject=#{self.subject}&text=#{self.message}&from=#{self.email}&api_user=#{VARS[:user_name]}&api_key=#{VARS[:password]}"
    # https://sendgrid.com/api/mail.send.json
    { 
      body: { status: 'OK' }, 
      status: 200,
      to: self.to, 
      toname: self.name, 
      subject: self.subject, 
      text: self.message, 
      from: self.email, 
      api_user: VARS[:user_name],
      api_key: VARS[:password]
    }.to_json
  end

end

class Mailer

  def call env
    request = Rack::Request.new(env)
    case request.request_method
    when 'POST'
      begin
        mail = MailCarrier.new(request.params)
      rescue MailCarrier::InvalidParams => error
        # [200, {"Content-Type" => "application/json"}, [{status: 200, message: error.message}.to_json]]
        [200, {"Content-Type" => "text/plain"}, [error.message] ]
      else
        mail.deliver
        # [200, {"Content-Type" => "application/json"}, [{status: 200, message: "Success"}.to_json]]
        [200, {"Content-Type" => "text/plain"}, ["Email enviado com sucesso"]]
        # sendgrid api
        # [200, {"Content-Type" => "application/json"}, [mail.json]]
      end
    else
      [404, {}, ["Lost"]]
    end
  end

end

config.ru

require './simple_rack_mail'

use Rack::Static, 
      :urls => ["/images", "/javascripts", "/stylesheets"], 
      :root => Dir.pwd

run lambda { |env|
  [200,
    { 'Content-Type'  => 'text/html',
      'Cache-Control' => 'public, max-age=86400'},
    File.open('index.html', File::RDONLY)
  ]
}

map '/mail' do
  run Mailer.new
end