download slack emoji

download.py

#!/usr/bin/env python3.6

from datetime import datetime
import json
import os
import sys
import urllib.request

if len(sys.argv) < 2:
    print(f"usage: {sys.argv[0]} filelist.json")
    sys.exit(1)

filelist = sys.argv[1]

if len(sys.argv) < 3:
    d = os.path.join(os.getcwd(), datetime.now().strftime('%Y%m%d%H%M%S'))
else:
    d = sys.argv[2]

os.makedirs(d, exist_ok=True)

with open(filelist) as fp:
    files = json.load(fp)
    for name, url in files.items():
        _, ext = os.path.splitext(url)
        filename = os.path.join(d, f'{name}{ext}')

        if os.path.exists(filename):
            print(f"{filename} already exists")
        else:
            print(f"downloading {url} as {filename} ...")
            urllib.request.urlretrieve(url, filename)

filelist.js

// https://{team}.slack.com/customize/emoji
var obj = {};
document.querySelectorAll('.emoji_row').forEach((x) => {
    var url = x.querySelector('span').getAttribute('data-original');
    var name = x.querySelectorAll('td')[1].innerHTML.trim().replace(':','').replace(':','');
    obj[name] = url
});
console.log(JSON.stringify(obj));