alexa-app-with-promises-error-handling.js

app.launch(function(request, response) {                                                                                                                                                            [8/89]
    const accessTokenReceived = request.sessionDetails.accessToken;
    if (accessTokenReceived === undefined) {
        throw "no_access_token";
    }

    return user.getUserFromAccessTokenPromise(accessTokenReceived)
    .then(user => stuff.getStuffFromUserPromise(user).then(() => user.id))
    .then(userId => helper.getStaffUserIdPromise(userId))
    .then(() => {
        if (numberOfStaff !== 0) {
            return response.say(config.dialog.onLaunchIntent.case13.say)
                    .reprompt(config.dialog.onLaunchIntent.case13.reprompt)
                    .card(config.dialog.onLaunchIntent.case13.cardTitle, config.dialog.onLaunchIntent.case12.card)
                    .shouldEndSession(config.dialog.onLaunchIntent.case13.end);
        }
        throw "no_staff";
    });
});

app.error = (err, request, response) => {
    err = Object.assign({message: null}, err);
    switch (err.message) {
        case "no_access_token":
            response.say(config.dialog.onLaunchIntent.case10.say)
                .reprompt(config.dialog.onLaunchIntent.case10.reprompt)
                .linkAccount()
                .shouldEndSession(config.dialog.onLaunchIntent.end);
            break;
        case "not_good_access_token":
            response.say(config.dialog.onLaunchIntent.case10.say)
                .reprompt(config.dialog.onLaunchIntent.case10.reprompt)
                .linkAccount()
                .shouldEndSession(config.dialog.onLaunchIntent.case10.end);
            break;
        case "no_stuff":
            response.say(config.dialog.onLaunchIntent.case11.say)
                .reprompt(config.dialog.onLaunchIntent.case11.reprompt)
                .card(config.dialog.onLaunchIntent.case11.cardTitle, config.dialog.onLaunchIntent.case11.card)
                .shouldEndSession(config.dialog.onLaunchIntent.case11.end);
            break;
        case "no_staff":
            response.say(config.dialog.onLaunchIntent.case12.say)
                .reprompt(config.dialog.onLaunchIntent.case12.reprompt)
                .card(config.dialog.onLaunchIntent.case12.cardTitle, config.dialog.onLaunchIntent.case12.card)
                .shouldEndSession(config.dialog.onLaunchIntent.case12.end);
            break;
        default:
            response.say(config.dialog.onLaunchIntent.case6.say)
                .reprompt(config.dialog.onLaunchIntent.case6.reprompt)
                .card(config.dialog.onLaunchIntent.case6.cardTitle, config.dialog.onLaunchIntent.case6.card)
                .shouldEndSession(config.dialog.onLaunchIntent.case6.end);
    }
};