Bulk remove slack files older than 1 month

slack.rake

namespace :slack do 

  task :dropfiles do
    token = 'xoxp-?????' # h&f

    # get upser id
    user_id = 'U02B4AR0N'
    
    # get files
    cmd = "curl -s -X POST --data '#{{token: token, count: 1000, user: user_id}.to_query}' https://slack.com/api/files.list"
    files = run_slack_cmd(cmd)['files']

    # delete files older than 2 months
    files.each do |f|
      if Time.at(f['created']) < Date.today - 2.months
        data = {
          token: token, 
          file: f['id']
        }
        cmd = "curl -s -X POST --data '#{data.to_query}' https://slack.com/api/files.delete"
        pp run_slack_cmd(cmd)
      end
    end

  end

  def run_slack_cmd cmd
    JSON.parse(`#{cmd}`)
  end

end

go to:
https://my.slack.com/files

click on my files, than youll see your user_id in the url bar

go to https://api.slack.com/custom-integrations/legacy-tokens and generate a token for your channel and run it