slack teamのactiveなアカウントの画像をDLしてくれる君

script.rb

require "slack"
require 'open-uri'

YOUR_SLACK_APP_OAUTH_TOKEN = ENV['YOUR_SLACK_APP_OAUTH_TOKEN']

Slack.configure do |config|
  config.token = YOUR_SLACK_APP_OAUTH_TOKEN
end

members = Slack.users_list["members"].select { |m| !m["deleted"] }
members.each.with_index do |member, idx|
  puts "=================== #{idx} =======================" if idx % 10 == 0
  profile = member["profile"]
  url = profile["image_original"]
  if url.nil? || url.empty?
    url = profile["image_512"]
  end
  puts url
  filename = "#{profile["real_name"]}___#{profile["display_name"]}.png".gsub(" ", "_")
  puts filename

  begin
    file = open(url)
    IO.copy_stream(file, "./images/#{filename}")
  rescue e
    puts "FAILED!!!"
    puts "filename: #{filename}"
    puts "url: #{url}"
  end
end

こんなノリで動くはず

$ git clone https://gist.github.com/e2446029edd2205ee90d91b543aec0e2.git
$ mv e2446029edd2205ee90d91b543aec0e2 slack-profile-image-downloader && cd slack-profile-image-downloader
$ echo 'source "https://rubygems.org"\ngem "slack-api"' > Gemfile && bundle
$ mkdir images
$ YOUR_SLACK_APP_OAUTH_TOKEN=XXX bundle exec ruby script.rb

ネットワークI/O待ちで遅いんで、ちゃんとやるならコネクション張りっぱなしにしてthreadぶん回すのが良さそう