Alexa Endpoint Demo

app.rb

require "sinatra"
require "erb"

before do
  content_type :json
end

get "/" do
  { message: "Alexa Demo!" }.to_json
end

post "/endpoint" do
  req_body = JSON.parse(request.body.read)

  intent = req_body["request"]["intent"]
  value = intent["slots"]["pokemon"]["value"]

  template = File.open(File.dirname(__FILE__) + "/example.xml.erb", "rb").read
  response = {
    response: "You asked me about: #{value}. You gotta catch 'em all!"
  }
  ssml = ERB.new(template).result_with_hash(response)

  {
    version: "1.0",
    response: {
      outputSpeech: {
        type: "SSML",
        ssml: ssml,
      }
    }
  }.to_json
end

example.xml.erb

<speak>
  <voice>
    <%= response %>
  </voice>
</speak>

Gemfile

source "https://rubygems.org"

gem "sinatra"