Copy attachments from specific Slack channel

package.json

{
  "name": "slack",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "dependencies": {
    "fs": "^0.0.1-security",
    "glob": "^7.1.4"
  }
}

slack-files.js

// Prerequisites:
// 1. Have exported your workspace data from Slack
// 2. Have run [Slack Advanced Exporter](https://github.com/grundleborg/slack-advanced-exporter) with attachment download

const fs = require('fs')
const glob = require("glob")
const options = {};
const channelName = 'general';

// options is optional
glob("../../Downloads/workspace-slack-attachments/"+channelName+"/*.json", options, function (er, files) {
  // files is an array of filenames.
  // If the `nonull` option is set, and nothing
  // was found, then files is ["**/*.js"]
  // er is an error object or null.
  files.forEach(file => {

    fs.readFile(file, 'utf8', (err, fileContents) => {
      if (err) {
        console.error(err)
        return
      }
      try {
        const messages = JSON.parse(fileContents)
        if (messages && messages.length) {
          messages.forEach(message => {
            if (message && message.files) {
              message.files.forEach(file => {
                glob("../../Downloads/workspace-slack-attachments/__uploads/"+file.id+"/*.*", options, function (er, files) {

                  files.forEach(f => {
                    fs.copyFile(f, '../../Downloads/'+channelName+'/' + file.id + '_' + file.name, (err) => {
                      if (err) throw err;
                      console.log('Ok!');
                    });
                  });

                });
              });
            }
          })
        }
      } catch (err) {
        console.error(err)
      }
    })
  });
})