download-slack-emojis.mjs

/*
 *
 * In order to run this:
 * Get token to use with Slack API:
 * 1. Go to the customize emojis admin page in slack (usually the URL is <instance-name>.slack.com/customize/emoji)
 * 2. Open your networks tab and find the request to /api/emoji.adminList
 * 3. Check the form data that's submitted and grab the value called "token"
 *
 * Use token in Slack API to get all emojis:
 * 1. Go here: https://api.slack.com/methods/emoji.list/test
 * 2. Paste in your "token" that you got from step 3 in the section called "Or, provide your own token"
 * 3. Click "Test method" to fire the "test" API request
 * 4. Copy *just* the object in the response with the mapping from emoji name to URL
 * 5. Paste this object into a file in the same folder as this file called 'emojis.json'
 *   - This json file should be an object that maps from `name-of-emoji -> url-of-emoji`
 * 6. Remove any records in this file who's URL has the word `alias`
 *   - These are whenever you alias an emoji to another emoji. These aren't necessary
 *
 * Run script to utilize `emojis.json` mapping and download all emojis
 * 1. Create a folder called `images` next to this file
 * 2. Make sure to install node-fetch from npm
 * 3. Run this file with node. I used node v15.14.0
 *
 */

import fetch from 'node-fetch'
import fs from 'fs'
import { createRequire } from 'module'
const require = createRequire(import.meta.url)

const emojis = require('./emojis.json')

for (let emojiName of Object.keys(emojis)) {
  const url = emojis[emojiName]
  fetch(url).then((response) => {
    const tmp = url.split('.')
    const filetype = tmp[tmp.length - 1]
    console.log(`saving images/${emojiName}.${filetype}`)
    console.log(`url:`, url)
    const stream = fs.createWriteStream(`./images/${emojiName}.${filetype}`)
    stream.on('open', () => {
      console.log('opened socket-- writing')
      response.body.pipe(stream)
    })
  })
}

dope