Twilio FAX Receive by Twilio Function. FAX受信をTwilioで。

fax.received.js

exports.handler = function(context, event, callback) {

    console.log("event:",event);

    if ("received" != event.FaxStatus) {
        console.log("not fax?");
        console.log("FaxStatus:" + event.FaxStatus);
        console.log("ErrorCode:" + event.ErrorCode);
        console.log("From:" + event.From);
        //callback(null, "not fax?");
    }
    else {
        sendMailPdf(event.MediaUrl);
        postSlack(event.MediaUrl);
    }
    //callback(null, "finished");

    /*** sendmail ***/
    function sendMailPdf(url) {
        let nodemailer = require('nodemailer');

        let transporter = nodemailer.createTransport({
            host: context.FaxMailSmtpServer,
            port: 587,
            secure: false,
            auth: {
                user: context.FaxMailSmtpUser,
                pass: context.FaxMailSmtpPass
            }
        });

        let mailOptions = {
            from: context.FaxMailFromAddress,
            to: context.FaxMailToAddress,
            subject: 'Fax received, from:' + event.From,
            text: 'Fax received, from:' + event.From,
            attachments: [{ // use URL as an attachment
                filename: 'fax.pdf',
                path: url
            }]
        };

        transporter.sendMail(mailOptions, (error, info) => {
            if (error) {
                console.log(error);
            }
            else {
                console.log('Mail Message sent: %s', info.messageId);
            }
        });
    }

    /*** post to slack ***/
    function postSlack(urlpdf) {
        let rp = require('request-promise');
        let fs = require('fs');
        let util = require('util');

        let optionpdf = {
            method: 'GET',
            uri: urlpdf,
            encoding: null
        };

        let tmpfile = util.format("/tmp/%s.pdf", Math.floor(10000 * 10000 * Math.random()).toString(16));
        console.log("tmpfile:", tmpfile);

        rp(optionpdf)
            .then(function(parsedBodyA) {
                fs.writeFileSync(tmpfile, parsedBodyA);
            })
            .catch(function(errA) {
                console.log("Ae:", errA);
            })
            .finally(function() {
                // pdf download, success
                let optionslack = {
                    method: 'POST',
                    uri: "https://slack.com/api/files.upload",
                    formData: {
                        token: context.FaxSlackAccessToken,
                        file: fs.createReadStream(tmpfile),
                        filetype: "application/pdf",
                        channels: context.FaxSlackChannel,
                      	initial_comment: 'Fax received, from:' + event.From
                    }
                };

                rp(optionslack)
                    .then(function(parsedBodyB) {
                        console.log("Bs:", parsedBodyB);
                    })
                    .catch(function(errB) {
                        console.log("Be:", errB);
                    })
                    .finally(function() {
                        fs.unlink(tmpfile, function(errC) {
                            console.log("Bf:", errC);
                        });
                        console.log("erase temfile:", tmpfile);
                    });
            });
    }
};

function.Configuration.md

• Twilio FunctionsのConfigurationの設定
  • Credentials
    Enable ACCOUNT_SID and AUTH_TOKEN : OFF
  • Environmental Variables
    • FaxMailSmtpServer …… メール送信時のSMTPサーバのアドレス
    • FaxMailSmtpPass …… メール送信時のSMTPアカウントのID
    • FaxMailSmtpUser …… メール送信時のSMTPアカウントのパスワード
    • FaxMailFromAddress …… メール送信時の送信元メールアドレス
    • FaxMailToAddress …… メール送信時の送信先メールアドレス
    • FaxSlackAccessToken …… Slack投稿時のAccessToken
    • FaxSlackChannel …… Slack投稿時の#チャンネル
  • Dependencies
    • nodemailer:4.4.0 …… メール送信用に使います
    • request-promise:4.2.2 …… 外部REST APIを呼び出すために使います

Twiml Bins, fax.incoming.xml

<?xml version="1.0" encoding="UTF-8"?>
<Response>
    <Receive action="https://ceaseless-trees-XXXX.twil.io/fax.received" />
</Response>