Eoin Bailey
Created October 29, 2016

Alt xkcd

Get the alt text for the current xkcd comic strip. Try to guess what the comic is about

60
Alt xkcd

Things used in this project

Story

Read more

Schematics

Interaction

Interaction and behind the scenes

Code

Lamba Code

JavaScript
Main function code
/**
 * App ID for the skill
 */
var APP_ID = '';

var http = require('http');

/**
 * The AlexaSkill prototype and helper functions
 */
var AlexaSkill = require('./AlexaSkill');

var AltXkcd = function () {
    AlexaSkill.call(this, APP_ID);
};

// Extend AlexaSkill
AltXkcd.prototype = Object.create(AlexaSkill.prototype);
AltXkcd.prototype.constructor = AltXkcd;

// ----------------------- Override AlexaSkill request and intent handlers -----------------------

AltXkcd.prototype.eventHandlers.onSessionStarted = function (sessionStartedRequest, session) {
    console.log("onSessionStarted requestId: " + sessionStartedRequest.requestIdci
        + ", sessionId: " + session.sessionId);
    // any initialization logic goes here
};

AltXkcd.prototype.eventHandlers.onLaunch = function (launchRequest, session, response) {
    console.log("onLaunch requestId: " + launchRequest.requestId + ", sessionId: " + session.sessionId);
    handleWelcomeRequest(response);
};

AltXkcd.prototype.eventHandlers.onSessionEnded = function (sessionEndedRequest, session) {
    console.log("onSessionEnded requestId: " + sessionEndedRequest.requestId
        + ", sessionId: " + session.sessionId);
    // any cleanup logic goes here
};

/**
 * override intentHandlers to map intent handling functions.
 */
AltXkcd.prototype.intentHandlers = {
    "GetAltText": function (intent, session, response) {
        handleOneshotAltRequest(intent, session, response);
    },

    "AMAZON.HelpIntent": function (intent, session, response) {
        handleHelpRequest(response);
    },

    "AMAZON.StopIntent": function (intent, session, response) {
        var speechOutput = "Goodbye";
        response.tell(speechOutput);
    },

    "AMAZON.CancelIntent": function (intent, session, response) {
        var speechOutput = "Goodbye";
        response.tell(speechOutput);
    }
};

// -------------------------- AltXkcd Domain Specific Business Logic --------------------------

function handleWelcomeRequest(response) {
        speechOutput = {
            speech: "<speak>Welcome to Alt X. K. C. D. "
                + "You can get the alt text for the current comic."
                + "</speak>",
            type: AlexaSkill.speechOutputType.PLAIN_TEXT
        },
        repromptOutput = {
            speech: "I can load the alt text for the current X. K. C. D. "
                + "comic.",
            type: AlexaSkill.speechOutputType.PLAIN_TEXT
        };

    response.ask(speechOutput, repromptOutput);
}

function handleHelpRequest(response) {
    var speechOutput = "I can load the alt text for the current X. K. C. D. "
                + "comic.";
        + repromptText;

    response.ask(speechOutput, repromptText);
}


function handleOneshotAltRequest(intent, session, response) {

    // Issue the request, and respond to the user
    makeXkcdRequest(function xkcdResponseCallback(err, xkcdResponse) {
        var speechOutput;

        if (err) {
            speechOutput = "Sorry, the X. K. C. D. service is experiencing a problem. Please try again later";
        } else {
            speechOutput = "The current x. k. c. d. comic alt text is, "
                + xkcdResponse.alt + ".";
        }

        response.tellWithCard(speechOutput, "AltXkcd", speechOutput)
    });
}

function makeXkcdRequest(xkcdResponseCallback) {

    var endpoint = 'http://xkcd.com/info.0.json';
    http.get(endpoint, function (res) {
        var xkcdResponseString = '';
        console.log('Status Code: ' + res.statusCode);

        if (res.statusCode != 200) {
            xkcdResponseCallback(new Error("Non 200 Response"));
        }

        res.on('data', function (data) {
            xkcdResponseString += data;
        });

        res.on('end', function () {
            var xkcdResponseObject = JSON.parse(xkcdResponseString);

            if (xkcdResponseObject.error) {
                console.log("XKCD error: " + xkcdResponseObj.error.message);
                xkcdResponseCallback(new Error(xkcdResponseObj.error.message));
            } else {
                xkcdResponseCallback(null, xkcdResponseObject);
            }
        });
    }).on('error', function (e) {
        console.log("Communications error: " + e.message);
        xkcdResponseCallback(new Error(e.message));
    });
}

// Create the handler that responds to the Alexa Request.
exports.handler = function (event, context) {
    var altXkcd = new AltXkcd();
    altXkcd.execute(event, context);
};

Alexa Samples

Alt xkcd is based off the TidePooler sample skill

Alexa alt xkcd code

Credits

Eoin Bailey

Eoin Bailey

1 project • 0 followers
Thanks to Randall Munroe.

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