The Alexa Skill

This is a CDK Pattern to deploy an Alexa Skill backed by a Lambda Function and a DynamoDB Table.

NB: This is slightly more complicated than the normal patterns because Alexa is an Amazon product as opposed to an AWS one so you need to setup an Amazon Developer Account with permissions to deploy the skill

Some References:

Author	Link
AWS	Build An Engaging Alexa Skill
AWS	ASK CLI Docs
AWS	Starter Alexa Skill Code
AWS	Implementing Persistent Storage In Your Fulfillment Lambda

Prerequisites

Unfortunately these steps cannot be skipped or shortened as you need to configure an Amazon developer account and acquire an OAuth 2.0 Refresh token that allows you to deploy your skill using CloudFormation.

1. Create an Amazon Developer account

Alexa is an Amazon product even though it can be deployed through AWS you still need to have a separate Amazon Developer account

2. Create a Developer Account Security Profile.

Open the Developer Account Security Profile page and feel free to use whatever values you want for the Security Profile Name and Description. The Privacy Notice URL must be a valid URL format but does not need to be a valid URL. Once you create your security profile, navigate to the Web Settings tab and add the following as Allowed Return URLs:

• http://127.0.0.1:9090/cb
• https://s3.amazonaws.com/ask-cli/response_parser.html

3. Copy Your Client Id and Client Secret from the security profile

Keep these values safe as we will use them in a second.

4. Make Sure You Have An AWS Account with CLI Access

You will need this to deploy the CDK stack anyway but for the next step we need to associate Alexa with our AWS Account so this is crucial

5. Setup ASK CLI on your local machine

Alexa needs to associate your Amazon Developer Account with your AWS Account. The easiest way to do this is to run ask configure after you have installed the Alexa Skills Kit CLI

6. Generate a Refresh Token

We are going to use Postman to fetch a new OAuth 2.0 token

Follow this guide : Setup Postman OAuth 2.0 request

Set the following key/values in the request:

Field	Value
Grant Type	Authorization Code
Callback URL	http://127.0.0.1:9090/cb
Auth URL	https://www.amazon.com/ap/oa
Access Token URL	https://api.amazon.com/auth/o2/token
Client ID	{YOUR_CLIENT_ID}
Client Secret	{YOUR_CLIENT_SECRET}
Scope	alexa::ask:skills:readwrite alexa::ask:models:readwrite alexa::ask:skills:test alexa::ask:catalogs:read alexa::ask:catalogs:readwrite

A Pop-Up should show up prompting you to log into your Developer account. Log in and you will be redirected to Postman where you should have a refresh_token to use in the next steps. Make sure you select the refresh_token and not the Access Token from the postman response (scroll down in the response!).

7. Copy Your Vendor ID

Visit the Customer Details Page for your Amazon Developer Account and make a note of your "vendor ID"

Before You Deploy

You need to add your ClientID, ClientSecret, Refresh Token and VendorID to the skill resource which can be found in the-alexa-skill/typescript/lib/the-alexa-skill-stack.ts

      vendorId: 'foo',
      authenticationConfiguration: {
        clientId: 'foo',
        clientSecret: 'bar',
        refreshToken: 'foobar'
      },

How Do I Test This After Deployment?

1. Navigate to the Alexa Developer Console, or follow this link - https://developer.amazon.com/alexa/console/ask
2. If you see a skill named "CDK Patterns Sample" in your Alexa Skills list then it has successfully been uploaded! Now we just need to test the skill itself.
3. Select the CDK Patterns Sample skill by clicking on the name.
4. On the next page, select "Test" at the top of the screen.
5. Amazon will ask if you'd to use your microphone or not. This is entirely optional as you may test Alexa using either voice commands or the text box provided.
6. Change the "skill testing is enabled in:" option from "Off" to "Development" if needed.
7. Either type or say "CDK Patterns" (Case sensitive if typing) and wait for a response.
8. The response should be "Hey, it's Pancakes the CDK Otter here, what would you like to know?"
9. For further testing, either type or say "What patterns do you have?"
10. The response should be "I have many patterns for you to see! For example, there is" followed by three pattern names randomly picked from CDK Patterns.
11. Now we just need to confirm that it is interacting with DynamoDB correctly.
12. Go to the AWS Console and navigate to DynamoDB. Open your tables and find the one corresponding to TheAlexaSkillStack.
13. Confirm that one item is in the table (It should have 2 attributes and a UserID). If it does then congratulations! Everything works!

Available Versions

• TypeScript
• Python