Twilio function to forward SMS/MMS as email using AWS SES

twilio-forward-as-email-with-aws-ses.js

const AWS = require('aws-sdk');
AWS.config.update({region: 'us-west-2'});
const mailcomposer = require('mailcomposer');
const extName = require('ext-name');
const urlUtil = require('url');
const path = require('path');

exports.handler = function(context, event, callback) {
    let attachments = [];
    
    for (var i = 0; i < event.NumMedia; i++) {
        const mediaUrl = event[`MediaUrl${i}`];
        const contentType = event[`MediaContentType${i}`];
        const extension = extName.mime(contentType)[0].ext;
        const mediaSid = path.basename(urlUtil.parse(mediaUrl).pathname);
        const filename = `${mediaSid}.${extension}`;
        attachments.push({path: mediaUrl, filename, contentType});
    }
    
    const mail = mailcomposer({
        from: context.FROM_EMAIL_ADDRESS,
        replyTo: context.FROM_EMAIL_ADDRESS,
        to: context.TO_EMAIL_ADDRESS,
        subject: `Message from ${event.From} (via Twilio to ${event.To})`,
        text: event.Body,
        attachments: attachments,
    });
    
    mail.build((err, message) => {
        if (err) {
            return callback(err);
        }
        
        const ses = new AWS.SES({apiVersion: '2010-12-01'});
        ses.sendRawEmail({RawMessage: {Data: message}}, (err, data) => {
            if (err) {
                return callback(err);
            }
            callback(null, '');
        });
    });
};