Using Nodemailer with Dialogflow Fulfillment 0.6.1

Question

I have tested my nodemailer nodejs code and it works. The problem I am facing now is I realize when I change my Dialogflow Fulfillment version from 0.5.0 to 0.6.1 for Firebase db, the nodemailer will crash. However, when I switch it back to 0.5.0, it works.

Can I know how to I tackle this? Do I need to add in additional code for ver 0.6.1 or what is the difference?

My code as following:

// See https://github.com/dialogflow/dialogflow-fulfillment-nodejs
// for Dialogflow fulfillment library docs, samples, and to report issues
'use strict';
 
const functions = require('firebase-functions');
const {WebhookClient} = require('dialogflow-fulfillment');
const {Card, Suggestion} = require('dialogflow-fulfillment');

const nodemailer = require('nodemailer');
const transporter = nodemailer.createTransport({
  service: 'gmail',
      auth: {
        user: 'EMAIL',
        pass: 'APP PASSWORD'
      }
});

process.env.DEBUG = 'dialogflow:debug'; // enables lib debugging statements
 
exports.dialogflowFirebaseFulfillment = functions.https.onRequest((request, response) => {
  const agent = new WebhookClient({ request, response });
  console.log('Dialogflow Request headers: ' + JSON.stringify(request.headers));
  console.log('Dialogflow Request body: ' + JSON.stringify(request.body));
 
  function welcome(agent) {
    agent.add(`Welcome to my agent!`);
  }
 
  function fallback(agent) {
    agent.add(`I didn't understand`);
    agent.add(`I'm sorry, can you try again?`);
  }

  function sendEmail(agent){
    const email = agent.parameters.email;
    const name = agent.parameters.name;
    const cls = agent.parameters.cls;
    const message = agent.parameters.message;
    
    const mailOptions = {
      from: 'SENDER EMAIL',
      to: 'EMAIL',
      cc: email,
      subject: "ABC",
      text: "MESSAGE:" + 
      '\n\n Name: ' + name + 
      '\n\n Class: ' + cls + 
      '\n\n Email: ' + email +
      '\n\n Message: ' + message
    };

    transporter.sendMail(mailOptions, function(error, info){
      if (error) {
        console.log(error);
      } 
      else {
        console.log('Email sent: ' + info.response);
      }
    });
  }
  // Run the proper function handler based on the matched Dialogflow intent name
  let intentMap = new Map();
  intentMap.set('Default Welcome Intent', welcome);
  intentMap.set('Default Fallback Intent', fallback);
  intentMap.set('Email Enquiry', sendEmail);
  agent.handleRequest(intentMap);
});

{
  "name": "dialogflowFirebaseFulfillment",
  "description": "This is the default fulfillment for a Dialogflow agents using Cloud Functions for Firebase",
  "version": "0.0.1",
  "private": true,
  "license": "Apache Version 2.0",
  "author": "Google Inc.",
  "engines": {
    "node": "10"
  },
  "scripts": {
    "start": "firebase serve --only functions:dialogflowFirebaseFulfillment",
    "deploy": "firebase deploy --only functions:dialogflowFirebaseFulfillment"
  },
  "dependencies": {
    "actions-on-google": "^2.2.0",
    "firebase-admin": "^5.13.1",
    "firebase-functions": "^2.0.2",
    "dialogflow": "^0.6.0",
    "dialogflow-fulfillment": "^0.6.1",
    "nodemailer": "^6.6.3"
  }
}

ERROR:

Function execution took 150 ms, finished with status: 'crash'

Dialogflow fulfillment error : Webhook call failed. Error: UNAVAILABLE, State: URL_UNREACHABLE, Reason: UNREACHABLE_5xx, HTTP status code: 500.

Answer 1

Ok, so I was able to send the mail, here is my updated code to your sendEmail function based on the block you provide:

function sendEmail(agent){

    // parameters must exist else it will be show as undefined
    const email = agent.parameters.email;
    const name = agent.parameters.name;
    const cls = agent.parameters.cls;
    const message = agent.parameters.message;
    
    // to avoid the issue with \n using plain text i switch to html with '<br>'
    const mailOptions = {
      from: 'email from',
      to: 'email to',
      cc: email,
      subject: "ABC",
      html: "MESSAGE:" + 
      '<br> Name: ' + name + 
      '<br> Class: ' + cls + 
      '<br> Email: ' + email +
      '<br> Message: ' + message
    };
 
    // show in the log your mail options
    console.log(mailOptions);
    
    transporter.sendMail(mailOptions, function(error, info){
        if (error) {
          console.log(error);
        } 
        else {
          console.log('Email sent: ' + info.response);
        }
    });
    
    agent.add("I send the mail!");
}

I recommend using try catch to catch this kind of issues:

try {
  // code to check
}
catch (e) {
  console.log("entering catch block");
  console.log(e);
  console.log("leaving catch block");
}

Useful Tips

• You can check the logs on by going to cloud functions -> my_deployed_ fullfillment -> logs
• Latest results are always show at the end.
• If no console message reach the log, make sure your function executes properly
• Based on the code you use, it looks like you are using an insecure way to deliver the mail. As a reminder be warn that your sample mail needs to implement this answer.
• If you are looking for something more secure there are samples on the web like this case.

Useful Links

• nodemailer message
• dialogflow fulfillment nodejs
• inline editor