Extracting / Exporting custom emoji from Slack

00_README

This builds off the excellent work of @lmarkus.

The scripts below can be used in conjunction with the Neutral Face Emoji Tools Google Chrome extension to (bulk!) 
export emojis from one Slack team and import into another team: 
https://chrome.google.com/webstore/detail/neutral-face-emoji-tools/anchoacphlfbdomdlomnbbfhcmcdmjej

Original work here: https://gist.github.com/lmarkus/8722f56baf8c47045621

Steps:
1) Run js in dev tools
2) Save json object in a txt file
3) Run bash script
4) Drag and drop all of the downloaded emojis in the bulk uploader 
  enabled through the chrome extension 

downloadSlackEmojis.sh

#!/usr/bin/env bash
# Use: 
# Make this file executable, and feed it the results from the Slack emoji URL dump. Files will be downloaded to `output`
# 	chmod +x downloadSlackEmojis.sh
# 	./downloadSlackEmojis.sh emojiURLs.txt
#
# Note: This depends on the jq utility for parsing json from the command line - https://stedolan.github.io/jq/

mkdir -p output;

jq -r '.[] | "curl -s -o \"output/\(.name)\(.extension)\" \"\(.url)\""' $1 | \
while read -r line; do eval "$line"; done

# You can now drag and drop all the emoji files in the output folder to the Bulk Emoji Uploader space that you'll see on
# the https://<team>.slack.com/customize/emoji page if you've installed the chrome extension
# https://chrome.google.com/webstore/detail/neutral-face-emoji-tools/anchoacphlfbdomdlomnbbfhcmcdmjej

extractSlackEmojiUrls.js

// Login to your team through the browser. 
// Go to: https://<team name>.slack.com/customize/emoji
// Run this on the browser's dev tools javascript console

// This code scrolls to bottom of page to load all emojis
// (bc of virtualized list not revelaing all of the elements).
// Slow connections may wish to adjust the above factor past 2.5
var scrollTime = $(document).height() * 2.5
$("html, body").animate({ scrollTop: $(document).height() }, scrollTime);

var emojis = $('.emoji_row');
var numEmojis = emojis.size();

var pre = document.createElement('pre');
pre.append('[\n');

// After waiting for the scroll, grab url/name for each emoji
// and populate a json object that will appear at the bottom of the page
window.setTimeout(function() {
    emojis.each(function(index) {
        var url = $(this).find('td:nth-child(1) span').attr('data-original');
        var extension = url.substring(url.lastIndexOf('.'));
        var name = $(this).find('td:nth-child(2)').html().replace(/:|\s/g, '');
        pre.append(JSON.stringify({ name: name, extension: extension, url: url }));
        if (index == (numEmojis - 1)) {
            pre.append('\n]');
        } else {
            pre.append(',\n');
        }
    });
    console.log(pre);
}, scrollTime + 1000);

// Now, at the bottom of the page you'll see the json representation of all the emoji data
// copy and paste the json into a file (named "emojiURLs.txt" in "downloadSlackEmojis.sh" instructions) 
// and use with downloadSlackEmojis.sh

Thank you for the procedure to follow and the explanations, it's very practical.

But, I would like to know how to run downloadSlackEmojis.sh on Windows (I don't have Linux)? Is there a simple command that could be translated?

Didn't work for me because of pagination. The above js scrolls the doc to the bottom, but not the actual container with items. For my long list I've tried the following:

var imgContainer = new Map();
var t = $('div.c-virtual_list__scroll_container')[0];
// Populate items present on the page at start
for (imgEl of $('img.p-customize_emoji_list__image')) {
    imgContainer.set(imgEl.alt, imgEl);
}
t.addEventListener("DOMNodeInserted", function(event) {
  el = event.target;
  imgElResults = $(el).find('img.p-customize_emoji_list__image');
  if (imgElResults.length) {
    imgEl = imgElResults[0];
    if (!imgContainer.has(imgEl.alt)) {
      imgContainer.set(imgEl.alt, imgEl);
    }
  }
}, false);
// Now scroll to the bottom and then to the top so that list populates. Scrolling to the top is not necessary if the list was at top already. 
var emojiArr = ['[\n'];
var emojiIndex = 0;
imgContainer.forEach(function(value, key, map) {
	var url = value.src;
	var extension = url.substring(url.lastIndexOf('.')); // key is name
	emojiArr.push(JSON.stringify({ name: key, extension: extension, url: url }) + (++emojiIndex < map.size ? ',\n' : '\n]'));
});
console.log(emojiArr.join(''));

Then copy the output and use as in original file.

@ksa-real your script works great but, I don't quite get how you got the scroll working ? many thanks

@ksa-real's version relies on you doing the scroll manually, as the container adds and removes objects as you scroll.

This one will scroll for you:

// Helper
// sleep time expects milliseconds
function sleep (time) {
  return new Promise((resolve) => setTimeout(resolve, time));
}


// Create a Map where we're going to store all of the images.
var imgContainer = new Map();
var t = $('div.c-virtual_list__scroll_container')[0];
// Populate items present on the page at start
for (imgEl of $('img.p-customize_emoji_list__image')) {
    imgContainer.set(imgEl.alt, imgEl);
}
t.addEventListener("DOMNodeInserted", function(event) {
  el = event.target;
  imgElResults = $(el).find('img.p-customize_emoji_list__image');
  if (imgElResults.length) {
    imgEl = imgElResults[0];
    if (!imgContainer.has(imgEl.alt)) {
      imgContainer.set(imgEl.alt, imgEl);
    }
  }
}, false);

// Now scroll to the bottom and then to the top so that list populates.
// Track the inside container's position
var scrollPosition = $('.c-scrollbar__hider')[0].scrollTop;
// Bump this higher if it's stopping mid-list.
var SLEEP_TIME = 750;

while(true) {
  // We're not sure how big the container is as it's loaded dynamically
  // So we scroll in increments of 500
  var newScrollPosition = $('.c-scrollbar__hider')[0].scrollTop += 500;
  // We know we've hit the bottom when the position stops changing
  if (newScrollPosition == scrollPosition) {
    break;
  }
  // Otherwise let's track the current position and keep going
  scrollPosition = newScrollPosition;
  // Sleep so the page can load the new emojis
  await sleep(SLEEP_TIME);
}

// Create the Array from the imgContainer map
var emojiArr = ['[\n'];
var emojiIndex = 0;
imgContainer.forEach(function(value, key, map) {
	var url = value.src;
	var extension = url.substring(url.lastIndexOf('.')); // key is name
	emojiArr.push(JSON.stringify({ name: key, extension: extension, url: url }) + (++emojiIndex < map.size ? ',\n' : '\n]'));
});
console.log(emojiArr.join(''));

@JPablomr your script works wonders, but for some reason, in Chrome, the virtual list stops loading after about 4 loads (manual or with your script)

FireFox will continue to load the virtual list indefinitely, but I get this error in the console:

SyntaxError: await is only valid in async functions and async generators debugger eval code:43:2

I tried to replace await sleep(SLEEP_TIME); in your script w/ the following: (async () => {await sleep(SLEEP_TIME);})(); but that doesn't seem to be doing the trick. Any thoughts on how to make the script FireFox dev console friendly?

UPDATE for 2019:
Hi folks... Author of the original gist here.
There's a much easier way to get the emoji list. I've updated the original gist, and added a Readme with the new approach.
( https://gist.github.com/lmarkus/8722f56baf8c47045621 )

Thanks to all the folks that have contributed to enhancing this solution over the years. ❤️ OpenSource!

Enjoy your emoji, and give me a follow on twitter @lennymarkus