How to Programatically Invite People to Slack Chatrooms

Posted by Josh on April 24, 2016

There are scripts that one can use (like Slakin) that let you create user registration forms for Slack. I was poking around in the Slakin code and the Slack API and I extracted the part that actually invites the users. You can use this code to create your own custom invite tools for Slack.

Here is an example of how to invite a user to Slack with Python 3:

import requests
from datetime import datetime

o = 'myslacksubdomain'  # Organization
t = '*********'  # API token
e = 'user@example.com'  # Email
c = 'C04H3KVI5'  # Channel IDs. I think this can be a comma-separated string of channels
# e.g., invite(o, t, e, c)

base_url = 'https://{}.slack.com/api'.format(o)

def invite(org, token, email, channel):
    """Invite a user to your Slack org."""
    ts = int(datetime.now().timestamp())
    url = '{}/users.admin.invite?t={}'.format(base_url, org, ts)
    payload = {
        'email': email,
        'token': token,
        'channels': channel,
        'set_active': True
    }
    headers = {
        'cache-control': "no-cache"
    }

    print('About to send payload: {}'.format(payload))
    print('to: {}'.format(url))

    res = requests.request('POST', url, headers=headers, params=payload)

    # See what gets sent back
    print('Got: {}'.format(res.status_code))
    print(res.text)

If you have questions, leave a comment below.