Download all images from a Slack channel

slack-images.py

import datetime

import requests

import os.path


TOKEN = 'xxxx-xxxx'
TARGET_DIR = './images/'

# get slack names
response = requests.get(
    'https://slack.com/api/users.list',
    params=dict(
        token=TOKEN
    )
)
content = response.json()
SLACK_NAMES = {
    u['id']: u['name']
    for u in content['members']
}

# get files
channel_name = 'foobar'
url = 'https://slack.com/api/search.files'
params = {
    'query': 'in:' + channel_name,
    'pretty': 1,
    'count': 1000,
    'token': TOKEN,
}
response = requests.get(url, params=params)
content = response.json()


def download_file(match):
    url = match['url_private_download']
    headers = {"Authorization": "Bearer {}".format(TOKEN)}

    filename = '{}r{}-{}-{}.{}'.format(
        TARGET_DIR,
        sum([reaction.get('count', 0) for reaction in match.get('reactions', [])]),
        datetime.datetime.fromtimestamp(match['timestamp']),
        SLACK_NAMES[match['user']],
        match['filetype']
    )
    if os.path.isfile(filename):
        print('{} exists, skipping...'.format(filename))
        return

    with open(filename, 'wb') as f:
        r = requests.get(url, stream=True, headers=headers)
        for chunk in r.iter_content(chunk_size=1024):
            if chunk:
                f.write(chunk)

    print('Saved: {}'.format(TARGET_DIR + filename))


for match in content['files']['matches']:
    download_file(match)