bilibili emoji downloader

bilibili_emoji_downloader.rb

#!/usr/bin/env ruby

require 'fileutils'
require 'json'
require 'net/http'

$download_dir = 'bilibili_emojis'
$cookie = 'SESSDATA=PUT_YOUR_SESSDATA_HERE'

def download(url, filename)
  if File.exists? filename
    puts "#{filename} is existed, so skip it."
    return
  end
  uri = URI.parse(url)
  http = Net::HTTP.new(uri.host, uri.port)
  http.request_get(uri.path) do | res |
    if not res.is_a?(Net::HTTPOK)
      puts res
      return
    end
    FileUtils.mkdir_p File.dirname(filename)
    File.open(filename, 'wb') do | file |
      file.binmode
      res.read_body do | chunk |
        file << chunk
      end
    end
    puts "#{filename} downloaded complete"
  end
end

uri = URI('http://api.bilibili.com/x/emote/setting/panel')
params = { 'business' => 'reply' }
uri.query = URI.encode_www_form(params)
headers = { 'cookie' => $cookie }
text = Net::HTTP.get(uri, headers)
emote = JSON.parse(text)
all_packages = emote['data']['all_packages']
emoji_packages = all_packages.select do | package |
  package['type'] != 4
end.map do | package |
  emoji = package['emote'].map do | em |
    {:name => em['text'], :url => em['url']}
  end
  {:name => package['text'], :emoji => emoji}
end

emoji_packages.each do | package |
  package[:emoji].each do | emoji |
    download(emoji[:url], "#{$download_dir}/#{package[:name]}/#{emoji[:name].sub(/^\[(.*)\]$/, '\1')}#{File.extname(emoji[:url])}")
  end
end