Simple contact form Rack middleware for use in middleman #pcs_code_example

config.ru

# Modified version of TryStatic, from rack-contrib
# https://github.com/rack/rack-contrib/blob/master/lib/rack/contrib/try_static.rb

# Serve static files under a `build` directory:
# - `/` will try to serve your `build/index.html` file
# - `/foo` will try to serve `build/foo` or `build/foo.html` in that order
# - missing files will try to serve build/404.html or a tiny default 404 page
use Rack::Reloader, 0

require './rack_emailer'
use Rack::Emailer

require './trystatic'
use Rack::TryStatic, :root => "build", :urls => %w[/], :try => ['.html', 'index.html', '/index.html']

# Run your own Rack app here or use this one to serve 404 messages:
run lambda{ |env|
  not_found_page = File.expand_path("../build/404.html", __FILE__)
  if File.exist?(not_found_page)
    [ 404, { 'Content-Type'  => 'text/html'}, [File.read(not_found_page)] ]
  else
    [ 404, { 'Content-Type'  => 'text/html' }, ['404 - page not found'] ]
  end
}

rack_emailable.rb

require 'mail'

module Rack
  class Emailer
    def initialize(app)
      @app = app
    end

    def call(env)
      request = Rack::Request.new(env)
      if request.path == '/send-email' && request.post?
        honeypot = request.params['b6314b059ffe32e6b84df0616d4bdbbe']
        if honeypot && !honeypot.empty?
          puts 'spammer attempt'
          return [406, {'Location' => request.base_url + '/contact', 'Content-Type' => 'text/html'}, ['']]
        else
          deliver_mail(request.params)
          return [301, {'Location' => request.base_url + '/contact/success', 'Content-Type' => 'text/html'}, ['']]
        end
      end
      @app.call(env)
    end

    def deliver_mail(params)
      begin
        message = ''
        message << "from: #{params['sender']}\n"
        message << "body: #{params['message']}\n"
        to = 'Portland Code School <[email protected]>'
        from = 'Portland Code School <[email protected]>'
        Mailer.deliver(
          from, to, params['subject'], message)
      rescue Exception => e
        puts "Mail send failure #{e}"
        # TODO: Log this error somewhere intelligent
      end
    end
  end
end

Mail.defaults do
  delivery_method :smtp,
  {
    :address   => "smtp.sendgrid.net",
    :port      => 587,
    :user_name => ENV['SENDGRID_USERNAME'],
    :password  => ENV['SENDGRID_PASSWORD'],
    :authentication => 'plain',
    :enable_starttls_auto => true,
    :domain    => "portlandcodeschool.com" # I usually set this as an env. var too
  }
end

module Mailer
  def self.deliver(msg_sender, msg_receiver, msg_subject, msg_body)
    Mail.deliver do
      from msg_sender
      to msg_receiver
      subject msg_subject
      text_part do
        body msg_body
      end
    end
  end
end

trystatic.rb

module Rack

  class TryStatic

    def initialize(app, options)
      @app = app
      @try = ['', *options.delete(:try)]
      @static = ::Rack::Static.new(lambda { [404, {}, []] }, options)
    end

    def call(env)
      orig_path = env['PATH_INFO']
      found = nil
      @try.each do |path|
        resp = @static.call(env.merge!({'PATH_INFO' => orig_path + path}))
        break if 404 != resp[0] && found = resp
      end
      found or @app.call(env.merge!('PATH_INFO' => orig_path))
    end
  end
end