Watson Image Recognition Slack Bot

index.js

require('dotenv').config();
const RtmClient = require('@slack/client').RtmClient;
const WebClient = require('@slack/client').WebClient;
const RTM_EVENTS = require('@slack/client').RTM_EVENTS;
const VisualRecognitionV3 = require('watson-developer-cloud/visual-recognition/v3');
const fs = require('fs');
const request = require('request');
const path = require('path');

const rtm = new RtmClient(process.env.SLACK_TOKEN);
const web = new WebClient(process.env.SLACK_TOKEN);

function recognize(image) {
  const visual_recognition = new VisualRecognitionV3({
    api_key: process.env.WATSON_KEY,
    version_date: '2016-05-19'
  });

  const params = {
    image_file: fs.createReadStream(image)
  };

  return new Promise((resolve, reject) => {
    visual_recognition.classify(params, function(err, res) {
      if (err) {
        reject(err);
      } else {
        resolve(res);
      }
    });
  });
}

rtm.on(RTM_EVENTS.MESSAGE, (message) => {
  if (!message.text ) { return }
  if (message.user === rtm.activeUserId) { return }

  const permalink = message.text.replace('<', '').replace('>', '');

  if (permalink.match(/^http/) && permalink.match(/\.(png|gif|jpg|jpeg)$/)) {
    const filename = "/tmp/" + Math.random().toString(36) + path.extname(permalink);
    request({
      uri: permalink
    }).pipe(fs.createWriteStream(filename)).on('close', () => {
      recognize(filename)
        .then((response) => {
          const [primaryClass, ...secondaryClasses] = response.images[0].classifiers[0].classes;
          const fields = secondaryClasses.map((aClass) => {
            return {
              short: true,
              title: aClass['class'],
              value: `${Math.round(aClass.score * 100)}%`
            };
          });
          const slackResponse = {
            as_user: true,
            attachments: [
              {
                color: "#466BB0",
                title: `Looks like you posted an image with a ${primaryClass['class']} in it.`,
                text: "Other things I see:",
                fields: fields
              }
            ]
          }
          web.chat.postMessage(message.channel, '', slackResponse, (err) => {
            console.log(err);
          });
        })
        .catch((err) => {
          console.log(err);
        });
    });
  }
});

rtm.start();

Could you please share the complete app? with packages.json and all files to use? thanks!