Voice mail

const moment = require('moment');
const { google } = require('googleapis');
exports.handler = function(context, event, callback) {
    const cal = google.calendar({
        version: 'v3',
        auth: context.GOOGLE_API_KEY
    });

  cal.freebusy.query({
        resource: {
            timeMin: moment().toISOString(), 
            timeMax: moment().add(10,'minutes').toISOString(),
            items: [{ id: context.GOOGLE_CALENDAR_ID }]
        }
    })
.then((result) => {
        const busy = result.data.calendars[calendar].busy;
        if (busy.length !== 0) {
                //Say I am unavailable
                let twiml = new Twilio.twiml.VoiceResponse();
                twiml.say("Sorry, Nathaniel is unavailable right now. If you leave a message he will get back to you as soon as possible.");
                twiml.record({
                             timeout: 10,
                             recordingStatusCallback: '/voicemail',
                             recordingStatusCallbackEvent: 'completed'
                 });
                callback(null, twiml);
        } else {
            // Forward to mobile
           let twiml = new Twilio.twiml.VoiceResponse();
                 twiml.dial(context.MOBILE_NUMBER);
                 callback(null, twiml);
        }
    }) 
}