messenger.rb

get '/' do
  content_type 'text/xml'
  Twilio::TwiML::Response.new do |r|
    r.Play WELCOME_MESSAGE_FILE
    r.Redirect '/record', method: 'get'
  end.text
end

get '/record' do
  content_type 'text/xml'
  Twilio::TwiML::Response.new do |r|
    r.Play INTRODUCTION_MESSAGE_FILE
    r.Record maxLength: 60, action: '/recorded', method: 'post'
  end.text
end

post '/recorded' do
  begin
    raise ArgumentError unless params[:RecordingSid]
    rec = Record.create(
      sid: params[:RecordingSid],
      recording_url: params[:RecordingUrl],
      from: params[:From],
      note: 'Created'
    )
    redirect "/confirm/#{rec.sid}"
  rescue Exception => e
    redirect '/confirmed'
  end
end

get '/confirm/:sid' do
  content_type 'text/xml'
  rec = Record.where(sid: params[:sid]).first
  Twilio::TwiML::Response.new do |r|
    r.Gather action: "/respond_to_confirm/#{rec.sid}", method: 'post', numDigits: 1, timeout: 10 do |g|
      g.Play PLAY_RECORDED_MESSAGE_FILE
      g.Play rec.recording_url
      g.Play CONFIRMATION_MESSAGE_FILE
    end
    r.Redirect "/confirm/#{params[:sid]}", method: 'get'
  end.text
end

post '/respond_to_confirm/:sid' do
  rec = Record.where(sid: params[:sid]).first
  case params[:Digits]
  when '3','2'
    rec.note = 'Rejected'
    rec.save
    redirect '/record'
  when '1'
    rec.note = 'Confirmed'
    rec.save
    redirect '/confirmed'
  else
    redirect "/confirm/#{rec.sid}"
  end
end

get '/confirmed' do
  content_type 'text/xml'
  Twilio::TwiML::Response.new { |r| r.Play THANKS_MESSAGE_FILE }.text
end

get '/admin' do
  # よしなに管理画面をつくった
end