Delete Slack files older than 30 days. Rewrite of https://gist.github.com/jamescmartinez/909401b19c0f779fc9c1

slack_delete.py

import requests
import time
import json

token = ''

#Delete files older than this:
ts_to = int(time.time()) - 30 * 24 * 60 * 60

def list_files():
  params = {
    'token': token
    ,'ts_to': ts_to
    ,'count': 1000
  }
  uri = 'https://slack.com/api/files.list'
  response = requests.get(uri, params=params)
  return json.loads(response.text)['files']

def delete_files(file_ids):
  count = 0
  num_files = len(file_ids)
  for file_id in file_ids:
    count = count + 1
    params = {
      'token': token
      ,'file': file_id
      }
    uri = 'https://slack.com/api/files.delete'
    response = requests.get(uri, params=params)
    print count, "of", num_files, "-", file_id, json.loads(response.text)['ok']

files = list_files()
file_ids = [f['id'] for f in files]
delete_files(file_ids)

As of today, legacy tester tokens may no longer be created.
However, you can still use this script following this steps:

1. Create a Slack app on https://api.slack.com/apps?new_app=1 and assign that to your workspace.

2. Then within this new app, go to OAuth & Permissions and in the section Scopes > User Token Scopes add the files:read and files:write Oauth scopes.

3. Finally, you can now go to the top of the page and install the app to the workspace. After that you'll get the User OAuth Token that you can use on the script.

* Bare in mind that if you forget to add the scopes, or you need to modify them after you install the app to the workspace, you would need to reinstall it after changing the scopes.

I have also adapted the code to work with the Oauth authentication.
https://gist.github.com/IlanVivanco/d2a96abb364ccb3b59e198f1c5fdf673

@IlanVivanco good job! saved my time.

None of the scripts listed here works anymore for me. Something changed @slack?