Maya Hackston
Published © GPL3+

Smart Susan

Everybody loves a tea party. I can't afford a butler, so I turned a Lazy Susan into a Smart Susan.

IntermediateFull instructions provided7 hours751

Things used in this project

Hardware components

EV3 Programming Brick / Kit
LEGO MindStorms EV3 Programming Brick / Kit
Only used the brick and large motor all the other parts are specifically listed later.
×1
Echo Dot
Amazon Alexa Echo Dot
×1
Lego Components
Here is a link to a list of parts. https://docs.google.com/document/d/1Tyv7cik4YyE0GGAAxnmAQj9LO2FHSVin9-EfpWgFJmY/edit?usp=sharing
×1

Software apps and online services

Alexa Gadgets Toolkit
Amazon Alexa Alexa Gadgets Toolkit
Alexa Skills Kit
Amazon Alexa Alexa Skills Kit
VS Code
Microsoft VS Code
Ev3Dev

Story

Read more

Code

mission-06.py

Python
This is the python code for the ev3 brick.
#!/usr/bin/env python3
# Copyright 2019 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
# 
# You may not use this file except in compliance with the terms and conditions 
# set forth in the accompanying LICENSE.TXT file.
#
# THESE MATERIALS ARE PROVIDED ON AN "AS IS" BASIS. AMAZON SPECIFICALLY DISCLAIMS, WITH 
# RESPECT TO THESE MATERIALS, ALL WARRANTIES, EXPRESS, IMPLIED, OR STATUTORY, INCLUDING 
# THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT.

import os
import sys
import time
import logging
import json
import random
import threading

from enum import Enum
from agt import AlexaGadget

from ev3dev2.led import Leds
from ev3dev2.sound import Sound
from ev3dev2.motor import  OUTPUT_B, SpeedPercent, LargeMotor

# Set the logging level to INFO to see messages from AlexaGadget
logging.basicConfig(level=logging.INFO, stream=sys.stdout, format='%(message)s')
logging.getLogger().addHandler(logging.StreamHandler(sys.stderr))
logger = logging.getLogger(__name__)



class Command(Enum):
    """
    The list of preset commands and their invocation variation.
    These variations correspond to the skill slot values.
    """
    
    ROTATE = ['pass me','passme','rotate','serve','pass']
    PASSLEFT = ['left']
    PASSRIGHT = ['right']
    PASSACROSS = ['across']
    PASSNOTHING = ['nothing']


class MindstormsGadget(AlexaGadget):
    """
    A Mindstorms gadget that performs movement based on voice commands.
    Two types of commands are supported, directional movement and preset.
    """

    def __init__(self):
        """
        Performs Alexa Gadget initialization routines and ev3dev resource allocation.
        """
        super().__init__()

        # Gadget state
       # self.patrol_mode = False

        # Ev3dev initialization
        self.leds = Leds()
        self.sound = Sound()
        self.server = LargeMotor(OUTPUT_B)

        # Start threads
        #threading.Thread(target=self._patrol_thread, daemon=True).start()
        logger.info("Let's Dance")

    def on_connected(self, device_addr):
        """
        Gadget connected to the paired Echo device.
        :param device_addr: the address of the device we connected to
        """
        self.leds.set_color("LEFT", "GREEN")
        self.leds.set_color("RIGHT", "GREEN")
        logger.info("{} connected to Echo device".format(self.friendly_name))

    def on_disconnected(self, device_addr):
        """
        Gadget disconnected from the paired Echo device.
        :param device_addr: the address of the device we disconnected from
        """
        self.leds.set_color("LEFT", "BLACK")
        self.leds.set_color("RIGHT", "BLACK")
        logger.info("{} disconnected from Echo device".format(self.friendly_name))

    def on_custom_mindstorms_gadget_control(self, directive):
        """
        Handles the Custom.Mindstorms.Gadget control directive.
        :param directive: the custom directive with the matching namespace and name
        """
        try:
            logger.info("Receiving Alexa Message")
            payload = json.loads(directive.payload.decode("utf-8"))
            print("Control payload: {}".format(payload), file=sys.stderr)
           
            # Expected params: [command], [direction]
            self._activate(payload["command"], payload["direction"])

        except KeyError:
            print("Missing expected parameters: {}".format(directive), file=sys.stderr)

            

    def _activate(self, command, direction):
        """
        Handles preset commands.
        :param command: the preset rotate command
        :param direction: left, right, across, nothing
        """
        
        print("Activate command: ({}, {})".format(command, direction), file=sys.stderr)
        
        if command in Command.ROTATE.value: 
            logger.info("Rotating " )
            if direction in Command.PASSLEFT.value:
                self.server.on_for_degrees(SpeedPercent(-5),90)
            elif direction in Command.PASSACROSS.value:
                self.server.on_for_degrees(SpeedPercent(5),180)
            elif direction in Command.PASSRIGHT.value:
                self.server.on_for_degrees(SpeedPercent(5),90)    
          
    
        
  
    

    


if __name__ == '__main__':

    gadget = MindstormsGadget()

    # Set LCD font and turn off blinking LEDs
    os.system('setfont Lat7-Terminus12x6')
    gadget.leds.set_color("LEFT", "BLACK")
    gadget.leds.set_color("RIGHT", "BLACK")

    # Startup sequence
    gadget.sound.play_song((('C4', 'e'), ('D4', 'e'), ('E5', 'q')))
    gadget.leds.set_color("LEFT", "GREEN")
    gadget.leds.set_color("RIGHT", "GREEN")

    # Gadget main entry point
    gadget.main()

    # Shutdown sequence
    gadget.sound.play_song((('E5', 'e'), ('C4', 'e')))
    gadget.leds.set_color("LEFT", "BLACK")
    gadget.leds.set_color("RIGHT", "BLACK")

susan.json

JSON
Generated from Alexa Skills (slots, utterances, etc)
{
    "interactionModel": {
        "languageModel": {
            "invocationName": "tea club",
            "intents": [
                {
                    "name": "AMAZON.CancelIntent",
                    "samples": []
                },
                {
                    "name": "AMAZON.HelpIntent",
                    "samples": []
                },
                {
                    "name": "AMAZON.StopIntent",
                    "samples": []
                },
                {
                    "name": "AMAZON.NavigateHomeIntent",
                    "samples": []
                },
                {
                    "name": "CapturePersonIntent",
                    "slots": [
                        {
                            "name": "pone",
                            "type": "AMAZON.Animal"
                        },
                        {
                            "name": "ptwo",
                            "type": "AMAZON.Animal"
                        },
                        {
                            "name": "pthree",
                            "type": "AMAZON.Animal"
                        },
                        {
                            "name": "pfour",
                            "type": "AMAZON.Animal"
                        }
                    ],
                    "samples": [
                        "{pone} and  {ptwo} and {pthree} and {pfour}",
                        "{pone} {ptwo} {pthree} and {pfour}",
                        "{pone} {ptwo} {pthree} {pfour}"
                    ]
                },
                {
                    "name": "PassDirectionIntent",
                    "slots": [
                        {
                            "name": "direction",
                            "type": "Direction"
                        }
                    ],
                    "samples": [
                        "please pass {direction} ",
                        "{direction}",
                        "pass {direction} please",
                        "pass {direction}"
                    ]
                },
                {
                    "name": "PassSpecificIntent",
                    "slots": [
                        {
                            "name": "dish",
                            "type": "dish"
                        },
                        {
                            "name": "person",
                            "type": "AMAZON.Animal"
                        }
                    ],
                    "samples": [
                        "pass the {dish} to the {person} ",
                        "please pass the {dish} to the {person}",
                        "pass the {dish} to the {person} please",
                        "pass the {dish} to {person} please",
                        "please pass the {dish} to {person}",
                        "please pass {dish} to {person}",
                        "{dish} to {person}",
                        "pass {dish} to {person} "
                    ]
                },
                {
                    "name": "WhoIsHereIntent",
                    "slots": [],
                    "samples": [
                        "Who do you think is here",
                        "Who is here"
                    ]
                }
            ],
            "types": [
                {
                    "name": "Direction",
                    "values": [
                        {
                            "name": {
                                "value": "across"
                            }
                        },
                        {
                            "name": {
                                "value": "right"
                            }
                        },
                        {
                            "name": {
                                "value": "left"
                            }
                        }
                    ]
                },
                {
                    "name": "dish",
                    "values": [
                        {
                            "name": {
                                "value": "omelets"
                            }
                        },
                        {
                            "name": {
                                "value": "sponge cake"
                            }
                        },
                        {
                            "name": {
                                "value": "pancakes"
                            }
                        },
                        {
                            "name": {
                                "value": "buns"
                            }
                        },
                        {
                            "name": {
                                "value": "scones"
                            }
                        },
                        {
                            "name": {
                                "value": "sandwiches"
                            }
                        },
                        {
                            "name": {
                                "value": "puddings"
                            }
                        },
                        {
                            "name": {
                                "value": "dessert"
                            }
                        },
                        {
                            "name": {
                                "value": "pastries"
                            }
                        },
                        {
                            "name": {
                                "value": "muffin"
                            }
                        },
                        {
                            "name": {
                                "value": "jam"
                            }
                        },
                        {
                            "name": {
                                "value": "cookies"
                            }
                        },
                        {
                            "name": {
                                "value": "bread"
                            }
                        },
                        {
                            "name": {
                                "value": "tea"
                            }
                        },
                        {
                            "name": {
                                "value": "dish four"
                            }
                        },
                        {
                            "name": {
                                "value": "dish three"
                            }
                        },
                        {
                            "name": {
                                "value": "dish two"
                            }
                        },
                        {
                            "name": {
                                "value": "dish one"
                            }
                        }
                    ]
                }
            ]
        }
    }
}

Index.js

JavaScript
This is the main code of the Alexa Skill for the Smart Susan.
// This sample demonstrates handling intents from an Alexa skill using the Alexa Skills Kit SDK (v2).
// Please visit https://alexa.design/cookbook for additional examples on implementing slots, dialog management,
// session persistence, api calls, and more.
const Alexa = require('ask-sdk-core');
// using atributes attributesManager
const persistenceAdapter = require('ask-sdk-s3-persistence-adapter');
const Util = require('./util');
// adding ev3 code
const Common = require('./common');

// The namespace of the custom directive to be sent by this skill
const NAMESPACE = 'Custom.Mindstorms.Gadget';

// The name of the custom directive to be sent this skill
const NAME_CONTROL = 'control';

//*********************************** LaunchRequestHandler **************************************************

const LaunchRequestHandler = {
    canHandle(handlerInput) {
        return Alexa.getRequestType(handlerInput.requestEnvelope) === 'LaunchRequest';
    },
    async handle(handlerInput) {
        // get EV3 connection
        let request = handlerInput.requestEnvelope;
        let { apiEndpoint, apiAccessToken } = request.context.System;
        let apiResponse = await Util.getConnectedEndpoints(apiEndpoint, apiAccessToken);
        if ((apiResponse.endpoints || []).length === 0) {
            return handlerInput.responseBuilder
            .speak(`I could not find an EV3 Brick connected to this Echo device. Please check to make sure your EV3 Brick is connected, and try again.`)
            .getResponse();
        }

        // Store the gadget endpointId to be used in this skill session
        let endpointId = apiResponse.endpoints[0].endpointId || [];
        Util.putSessionAttribute(handlerInput, 'endpointId', endpointId);

        // Alexa voice outputs
        const speakOutput = 'Hello! Welcome to the tea club! Who is here today?';
        const repromptText = 'Could you repeat that?  Who is here?'; 
        
        return handlerInput.responseBuilder
            .speak(speakOutput)
            .reprompt(speakOutput)
            .getResponse();
    }
};

//**************************************** Custom Intent Handler ***********************************************
const CapturePersonIntentHandler = {
    canHandle(handlerInput) {
        return Alexa.getRequestType(handlerInput.requestEnvelope) === 'IntentRequest'
            && Alexa.getIntentName(handlerInput.requestEnvelope) === 'CapturePersonIntent';
    },
    // async for setting information
    async handle(handlerInput) {
        
        // getting names from voice command
        const pone = handlerInput.requestEnvelope.request.intent.slots.pone.value;
        const ptwo = handlerInput.requestEnvelope.request.intent.slots.ptwo.value;
        const pthree = handlerInput.requestEnvelope.request.intent.slots.pthree.value;
        const pfour = handlerInput.requestEnvelope.request.intent.slots.pfour.value;
        
        const attributesManager = handlerInput.attributesManager;
        
        // storing names for later use
        const peopleAttributes = {
            "pone" : pone,
            "ptwo" : ptwo,
            "pthree" : pthree,
            "pfour" : pfour
        };
        attributesManager.setPersistentAttributes(peopleAttributes);
        Util.putSessionAttribute(handlerInput, 'current', 0);
        await attributesManager.savePersistentAttributes();
  
        // Alexa voice responses
        const speakOutput = `Welcome to the tea club, ${pone}, ${ptwo}, ${pthree}, and ${pfour}.`;
        const reprompt = 'Please say pass left or pass right when you when to rotate the dishes.  You can say stop when you are done.';
        
        return handlerInput.responseBuilder
            .speak(speakOutput)
            .reprompt(reprompt)
            .getResponse();
    }
};


//**********************************************************Start*Direction*Intent*************************************************************************
const PassDirectionIntentHandler = {
    canHandle(handlerInput) {
        return Alexa.getRequestType(handlerInput.requestEnvelope) === 'IntentRequest'
            && Alexa.getIntentName(handlerInput.requestEnvelope) === 'PassDirectionIntent';
    },
    handle(handlerInput) {
        // get direction from voice command & set default 
        let direction = handlerInput.requestEnvelope.request.intent.slots.direction.value;
       
        if (direction === undefined) {
            direction = 'right';
        }
        
        // get values from memory (endpoint and current location)
        const attributesManager = handlerInput.attributesManager;
        let endpointId = attributesManager.getSessionAttributes().endpointId || [];
        let current = attributesManager.getSessionAttributes().current || 0; 
        
        // figure out which direction to rotate
        let goto = current;
        if (direction === 'right')
            goto = (current +1 + 4)%4
        else if (direction === 'left')
            goto = (current -1 + 4)%4
        else if (direction === 'across')
            goto = (current +2 + 4)%4
        
        // store current for later use
        Util.putSessionAttribute(handlerInput, 'current', goto);

        // Construct the directive to EV3 with the payload containing the move parameters
        let directive = Util.build(endpointId, NAMESPACE, NAME_CONTROL,
            {
                command: 'rotate',
                direction: direction
            });
        
        const speakOutput = `Passing ${direction}`;
        const reprompt = `Let me know when you would like me to pass something else`;
        
        return handlerInput.responseBuilder
            .speak(speakOutput)
            .reprompt(reprompt)
            .addDirective(directive)
            .getResponse();
    }
};
//**********************************************************End*Direction*Intent*************************************************************************


//************************************************************************* Who is Here ******************************************************************
const WhoIsHereIntentHandler = {
    canHandle(handlerInput) {
        return Alexa.getRequestType(handlerInput.requestEnvelope) === 'IntentRequest'
            && Alexa.getIntentName(handlerInput.requestEnvelope) === 'WhoIsHereIntent';
    },
    async handle(handlerInput) {
        
         // remembering who is at the table
        const attributesManager = handlerInput.attributesManager;
        const sessionAttributes = await attributesManager.getPersistentAttributes() || {};

        const pone = sessionAttributes.hasOwnProperty('pone') ? sessionAttributes.pone : 0;
        const ptwo = sessionAttributes.hasOwnProperty('ptwo') ? sessionAttributes.ptwo : 0;
        const pthree = sessionAttributes.hasOwnProperty('pthree') ? sessionAttributes.pthree : 0;
        const pfour = sessionAttributes.hasOwnProperty('pfour') ? sessionAttributes.pfour : 0;
        
        const speakOutput = `We have ${pone}, ${ptwo}, ${pthree}, and ${pfour}`;
    
        
        return handlerInput.responseBuilder
            .speak(speakOutput)
    }
};
//**********************************************************End*Who*is*Intent*************************************************************************


//**********************************************************Start*Specific*Intent*************************************************************************
const PassSpecificIntentHandler = {
    canHandle(handlerInput) {
        return Alexa.getRequestType(handlerInput.requestEnvelope) === 'IntentRequest'
            && Alexa.getIntentName(handlerInput.requestEnvelope) === 'PassSpecificIntent';
    },
    async handle(handlerInput) {
        // take person and dish name from voice command
        let wantedDish = handlerInput.requestEnvelope.request.intent.slots.dish.value;
        let wantedPerson = handlerInput.requestEnvelope.request.intent.slots.person.value
                
        // Alexa default voice response
        let speakOutput = `Passing ${wantedDish} to ${wantedPerson}`;
        
        // remembering who is at the table
        const attributesManager = handlerInput.attributesManager;
        const sessionAttributes = await attributesManager.getPersistentAttributes() || {};

        const pone = sessionAttributes.hasOwnProperty('pone') ? sessionAttributes.pone : 0;
        const ptwo = sessionAttributes.hasOwnProperty('ptwo') ? sessionAttributes.ptwo : 0;
        const pthree = sessionAttributes.hasOwnProperty('pthree') ? sessionAttributes.pthree : 0;
        const pfour = sessionAttributes.hasOwnProperty('pfour') ? sessionAttributes.pfour : 0;
       
        //lookup current dish in front of person zero
        let current = attributesManager.getSessionAttributes().current || 0;
        
        // personto - the person location where the dish is going
        let personto = 0;
      
        // matching voice command name with stored peoples names
        if (wantedPerson === pone) {
            personto = 0
        }
        else  if (wantedPerson === ptwo) {
            personto = 1
        }
        else if (wantedPerson === pthree) {
            personto = 2
        }
        else if (wantedPerson === pfour) {
            personto = 3
        }
        else {
            personto = 0
            speakOutput = `I know not of this ${wantedPerson} of whom you speak`
        }
            
        // preset food options
        const fone = 'cookies';
        const ftwo = 'honey';
        const fthree = 'tea';
        const ffour = 'milk';
        
        // dishto - the dish location where the dish is going
        let dishto = 0;
        
        // matching voice command dish name with dish name list
        if (wantedDish === fone) {
            dishto = 0
        }
        else  if (wantedDish === ftwo) {
           dishto = 1
        }
        else if (wantedDish === fthree) {
            dishto = 2
        }
        else if (wantedDish === ffour) {
            dishto = 3
        }
        else {
            dishto = 0
            speakOutput = speakOutput +  ` I know not of this ${wantedDish} which you desire`
        }
        
        // finding the dish that should be in front of person 0
        let goto = (dishto-personto+4)%4;
        // calculating how much to turn the table to get goto in front of person 0
        let turn = (current-goto+4)%4;
      
        //what direction to go in
        let direction = "nothing";
        if (turn === 0) {
            speakOutput = 'Voila!'
            direction = 'nothing'
        }
        else  if (turn === 1) {
            direction = 'left'
        }
        else if (turn === 2) {
            direction = 'across'
        }
        else if (turn === 3) {
            direction = 'right'
        }
        else {
            speakOutput = speakOutput +  ` I know not of this ${turn} which you desire`
        }
        
        // store the current position to use for the next rotation
        Util.putSessionAttribute(handlerInput, 'current', goto);
        
        // get endpoint to send the directive to the Mindstorm gadget
        let endpointId = attributesManager.getSessionAttributes().endpointId || [];
     
        // Construct the directive with the payload containing the move parameters
        let directive = Util.build(endpointId, NAMESPACE, NAME_CONTROL,
            {
                command: 'rotate',
                direction: direction
            });
            
        
        
        const reprompt = `Let me know when you would like me to pass something else`;
        
        return handlerInput.responseBuilder
            .speak(speakOutput)
            .reprompt(reprompt)
            .addDirective(directive)
            .getResponse();
    }
};


//**********************************************************End*Specific*Intent*************************************************************************

//****************************** default Alexa Handlers, now found in common.js **************************************************

// The SkillBuilder acts as the entry point for your skill, routing all request and response
// payloads to the handlers above. Make sure any new handlers or interceptors you've
// defined are included below. The order matters - they're processed top to bottom.
exports.handler = Alexa.SkillBuilders.custom()
.withPersistenceAdapter(
    new persistenceAdapter.S3PersistenceAdapter({bucketName:process.env.S3_PERSISTENCE_BUCKET}))
    .addRequestHandlers(
        LaunchRequestHandler,
        CapturePersonIntentHandler,
        PassDirectionIntentHandler,
        WhoIsHereIntentHandler,
        PassSpecificIntentHandler,
        Common.HelpIntentHandler,
        Common.CancelAndStopIntentHandler,
        Common.SessionEndedRequestHandler,
        Common.IntentReflectorHandler, // make sure IntentReflectorHandler is last so it doesn't override your custom intent handlers
    )
    .addErrorHandlers(
        Common.ErrorHandler,
    )
    .lambda();

common.js

JavaScript
Support file for index.js (same as alexa-gadget-minstorms)
/*
 * Copyright 2019 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
 *
 * You may not use this file except in compliance with the terms and conditions 
 * set forth in the accompanying LICENSE.TXT file.
 *
 * THESE MATERIALS ARE PROVIDED ON AN "AS IS" BASIS. AMAZON SPECIFICALLY DISCLAIMS, WITH 
 * RESPECT TO THESE MATERIALS, ALL WARRANTIES, EXPRESS, IMPLIED, OR STATUTORY, INCLUDING 
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
*/

'use strict'

const Alexa = require('ask-sdk-core');

const HelpIntentHandler = {
    canHandle(handlerInput) {
        return Alexa.getRequestType(handlerInput.requestEnvelope) === 'IntentRequest'
            && Alexa.getIntentName(handlerInput.requestEnvelope) === 'AMAZON.HelpIntent';
    },
    handle(handlerInput) {
        const speakOutput = 'You can say hello to me! How can I help?';

        return handlerInput.responseBuilder
            .speak(speakOutput)
            .reprompt(speakOutput)
            .getResponse();
    }
};
const CancelAndStopIntentHandler = {
    canHandle(handlerInput) {
        return Alexa.getRequestType(handlerInput.requestEnvelope) === 'IntentRequest'
            && (Alexa.getIntentName(handlerInput.requestEnvelope) === 'AMAZON.CancelIntent'
                || Alexa.getIntentName(handlerInput.requestEnvelope) === 'AMAZON.StopIntent');
    },
    handle(handlerInput) {
        const speakOutput = 'Goodbye!';
        return handlerInput.responseBuilder
            .speak(speakOutput)
            .getResponse();
    }
};
const SessionEndedRequestHandler = {
    canHandle(handlerInput) {
        return Alexa.getRequestType(handlerInput.requestEnvelope) === 'SessionEndedRequest';
    },
    handle(handlerInput) {
        // Any cleanup logic goes here.
        return handlerInput.responseBuilder.getResponse();
    }
};

// The intent reflector is used for interaction model testing and debugging.
// It will simply repeat the intent the user said. You can create custom handlers
// for your intents by defining them above, then also adding them to the request
// handler chain below.
const IntentReflectorHandler = {
    canHandle(handlerInput) {
        return Alexa.getRequestType(handlerInput.requestEnvelope) === 'IntentRequest';
    },
    handle(handlerInput) {
        const intentName = Alexa.getIntentName(handlerInput.requestEnvelope);
        const speakOutput = `You just triggered ${intentName}`;

        return handlerInput.responseBuilder
            .speak(speakOutput)
            .reprompt("I don't understand this command, try again")
            .getResponse();
    }
};

// Generic error handling to capture any syntax or routing errors. If you receive an error
// stating the request handler chain is not found, you have not implemented a handler for
// the intent being invoked or included it in the skill builder below.
const ErrorHandler = {
    canHandle() {
        return true;
    },
    handle(handlerInput, error) {
        console.log(`~~~~ Error handled: ${error.stack}`);
        const speakOutput = `Sorry, I had trouble doing what you asked. Please try again.`;

        return handlerInput.responseBuilder
            .speak(speakOutput)
            .reprompt(speakOutput)
            .getResponse();
    }
};

// The request interceptor is used for request handling testing and debugging.
// It will simply log the request in raw json format before any processing is performed.
const RequestInterceptor = {
    process(handlerInput) {
        let { attributesManager, requestEnvelope } = handlerInput;
        let sessionAttributes = attributesManager.getSessionAttributes();

        // Log the request for debug purposes.
        console.log(`=====Request==${JSON.stringify(requestEnvelope)}`);
        console.log(`=========SessionAttributes==${JSON.stringify(sessionAttributes, null, 2)}`);
    }
};

module.exports = {
    HelpIntentHandler,
    CancelAndStopIntentHandler,
    SessionEndedRequestHandler,
    IntentReflectorHandler,
    ErrorHandler,
    RequestInterceptor
    };

package.json

JSON
Support file for index.js (the s3 persistence adapter added)
{
    "name": "tea-club",
    "version": "1.1.0",
    "description": "alexa utility for quickly building skills",
    "main": "index.js",
    "scripts": {
      "test": "echo \"Error: no test specified\" && exit 1"
    },
    "author": "Amazon Alexa",
    "license": "ISC",
    "dependencies": {
      "ask-sdk-core": "^2.6.0",
      "ask-sdk-model": "^1.18.0",
      "aws-sdk": "^2.326.0",
      "ask-sdk-s3-persistence-adapter": "^2.0.0"
    }
  }

util.js

JavaScript
Support file for index.js (the s3 persistence adapter added)
// add to remember information across sessions

const AWS = require('aws-sdk');

const s3SigV4Client = new AWS.S3({
    signatureVersion: 'v4'
});

module.exports.getS3PreSignedUrl = function getS3PreSignedUrl(s3ObjectKey) {

    const bucketName = process.env.S3_PERSISTENCE_BUCKET;
    const s3PreSignedUrl = s3SigV4Client.getSignedUrl('getObject', {
        Bucket: bucketName,
        Key: s3ObjectKey,
        Expires: 60*1 // the Expires is capped for 1 minute
    });
    console.log(`Util.s3PreSignedUrl: ${s3ObjectKey} URL ${s3PreSignedUrl}`);
    return s3PreSignedUrl;

}

//***********************************************added from alexa mindstorm gadget *********************************************************

/*
 * Copyright 2019 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
 *
 * You may not use this file except in compliance with the terms and conditions 
 * set forth in the accompanying LICENSE.TXT file.
 *
 * THESE MATERIALS ARE PROVIDED ON AN "AS IS" BASIS. AMAZON SPECIFICALLY DISCLAIMS, WITH 
 * RESPECT TO THESE MATERIALS, ALL WARRANTIES, EXPRESS, IMPLIED, OR STATUTORY, INCLUDING 
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
*/

'use strict';

const Https = require('https');

/**
 * Build a custom directive payload to the gadget with the specified endpointId
 * @param {string} endpointId - the gadget endpoint Id
 * @param {string} namespace - the namespace of the skill
 * @param {string} name - the name of the skill within the scope of this namespace
 * @param {object} payload - the payload data
 * @see {@link https://developer.amazon.com/docs/alexa-gadgets-toolkit/send-gadget-custom-directive-from-skill.html#respond}
 */
exports.build = function (endpointId, namespace, name, payload) {
    // Construct the custom directive that needs to be sent
    // Gadget should declare the capabilities in the discovery response to
    // receive the directives under the following namespace.
    return {
        type: 'CustomInterfaceController.SendDirective',
        header: {
            name: name,
            namespace: namespace
        },
        endpoint: {
            endpointId: endpointId
        },
        payload
    };
};

/**
 * A convenience routine to add the a key-value pair to the session attribute.
 * @param handlerInput - the context from Alexa Service
 * @param key - the key to be added
 * @param value - the value be added
 */
exports.putSessionAttribute = function(handlerInput, key, value) {
    const attributesManager = handlerInput.attributesManager;
    let sessionAttributes = attributesManager.getSessionAttributes();
    sessionAttributes[key] = value;
    attributesManager.setSessionAttributes(sessionAttributes);
};

/**
 * To get a list of all the gadgets that meet these conditions,
 * Call the Endpoint Enumeration API with the apiEndpoint and apiAccessToken to
 * retrieve the list of all connected gadgets.
 *
 * @param {string} apiEndpoint - the Endpoint API url
 * @param {string} apiAccessToken  - the token from the session object in the Alexa request
 * @see {@link https://developer.amazon.com/docs/alexa-gadgets-toolkit/send-gadget-custom-directive-from-skill.html#call-endpoint-enumeration-api}
 */
exports.getConnectedEndpoints = function(apiEndpoint, apiAccessToken) {

    // The preceding https:// need to be stripped off before making the call
    apiEndpoint = (apiEndpoint || '').replace('https://', '');
    return new Promise(((resolve, reject) => {

        const options = {
            host: apiEndpoint,
            path: '/v1/endpoints',
            method: 'GET',
            headers: {
                'Content-Type': 'application/json',
                'Authorization': 'Bearer ' + apiAccessToken
            }
        };

        const request = Https.request(options, (response) => {
            response.setEncoding('utf8');
            let returnData = '';
            response.on('data', (chunk) => {
                returnData += chunk;
            });

            response.on('end', () => {
                resolve(JSON.parse(returnData));
            });

            response.on('error', (error) => {
                reject(error);
            });
        });
        request.end();
    }));
};

Credits

Maya Hackston

Maya Hackston

2 projects • 3 followers

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