delete old slack files (only images)

delete_my_slack_files.rb

require "slack"

#
# gem install slack-api
#
# Get the token from here: https://api.slack.com/docs/oauth-test-tokens
#

client = Slack::Client.new token: ENV['TOKEN']

LIMIT = 20 # days

user = client.auth_test

puts "#{user['user']} (#{user['user_id']})"

from_time = Time.now.to_i - (60 * 60 * 24 * LIMIT)
pages = client.files_list(user: user['user_id'], types: 'images', ts_to: from_time)['paging']['pages'].to_i

deleted_files_count = 0
cant_delete = 0

while pages > 0 do
  files = client.files_list(user: user['user_id'], page: pages, ts_to: from_time, types: 'images')['files']
  files.each_with_index do |file, index|
    print sprintf('Page %-4d => %10s (%d/%d)', pages, file['id'], index, files.length)

    response = client.files_delete(file: file['id'])
    deleted_files_count += 1 if response['ok']
    cant_delete += 1 if response['error'] == 'cant_delete_file'

    print "\r"
  end

  pages -= 1
end

puts sprintf('%-80s', "Deleted files: #{deleted_files_count}")
puts sprintf('%-80s', "Permission denied: #{cant_delete}")