Discord emote archiving tool

archive-emotes.rb

#!/usr/bin/env ruby

AUTH_TOKEN = ENV["DISCORD_TOKEN"]

OUTPUT_DIR = "./emoji-archive"
SERVER_LIST = [
  # List of server IDs here
]

require 'net/http'
require 'json'

API_BASE = "https://discord.com/api/v8"
API_GET_GUILD = "#{API_BASE}/guilds/{id}"

CDN_BASE = "https://cdn.discordapp.com"
CDN_EMOJI_URL = "#{CDN_BASE}/emojis/{id}.{ext}"

def http_request(method, url, params, header = {}, json: false)
  uri = URI url.gsub(/{(.+?)}/) { params[$1.to_sym] }

  http = Net::HTTP.new(uri.host, uri.port)
  http.use_ssl = true

  http.start do
    response = case method
    when :get then http.request_get(uri.request_uri, header)
    else fail "bad request type"
    end

    content = response.body
    content = JSON.parse(content, symbolize_names: true) if json
    return content
  end
end

emoji_count = 0

SERVER_LIST.each do |server|
  guild = http_request(:get, API_GET_GUILD, { id: server }, { 'Authorization' => AUTH_TOKEN }, json: true)
  puts %(Processing "#{guild[:name]}", emojis: #{guild[:emojis].length})
  emoji_count += guild[:emojis].length

  guild[:emojis].each do |emoji|
    fext = emoji[:animated] ? "gif" : "png"
    fname = "#{emoji[:name]}-#{emoji[:id][-8..-1]}"

    outpath = "#{OUTPUT_DIR}/#{fname}.#{fext}"
    next if File.exists?(outpath)

    imgdata = http_request(:get, CDN_EMOJI_URL, { id: emoji[:id], ext: fext })
    bytes = File.open(outpath, "wb") { _1.write(imgdata) }
    puts %(-- Downloaded :#{emoji[:name]}: (#{bytes} bytes))
  end

  sleep(0.2)
end

puts %(Total emojis: #{emoji_count})