In your README you may want to point folks to the best practice any Slack workspace member can do very quickly directly in Slack. See the Web Applications StackExchange: How do I invite all team members to a new Slack channel?

I'm fine with you assigning this issue to me. I just can't make time for this little pull request today.

—tbc MIT VI-3 '84

Not an issue, but I thought it would be helpful to other people to easily run this.

Create a new directory named "slack-bulkinviter", then once in that directory, copied the raw file there:

mkdir slack-bulkinviter && cd $_
curl -O https://raw.githubusercontent.com/robby-dermody/slack-bulkinviter/master/slack-bulkinviter.py

You'll also want to create your apikey.txt file in this same directory with the contents of your API key.

I then created file named Dockerfile and pasted in the following contents:

FROM python:3.8.2-buster

RUN pip install --no-cache-dir slacker

COPY slack-bulkinviter.py .
COPY apikey.txt .

Then built the docker image with:

docker build -t slack-bulkinviter .

At this point you should be all set, and can run the script like so:

docker run -it --rm slack-bulkinviter python slack-bulkinviter.py your-channel

Hope this is helpful to someone who doesn't have python already installed on their system, or just wants a clean disposable way to run this script!

When i specify private channel ID, it throws Cannot find channel error

Currently getting this error and have not been able to solve it as of yet. Any ideas?

Traceback (most recent call last):
  File "inviter.py", line 30, in <module>
    response = slack.channels.list()
  File "/Library/Python/2.7/site-packages/slacker/__init__.py", line 212, in list
    params={'exclude_archived': exclude_archived})
  File "/Library/Python/2.7/site-packages/slacker/__init__.py", line 68, in get
    return self._request(requests.get, api, **kwargs)
  File "/Library/Python/2.7/site-packages/slacker/__init__.py", line 63, in _request
    raise Error(response.error)
slacker.Error: invalid_auth

But when I do like here:

from slacker import Slacker

slack = Slacker('<your-slack-api-token-goes-here>')

# Send a message to #general channel
slack.chat.post_message('#general', 'Hello fellow slackers!')

# Get users list
response = slack.users.list()
users = response.body['members']

# Upload a file
slack.files.upload('hello.txt')

It works just fine... I have no experience in Python whatsoever, I've just managed to hack use their initialisation method...

Can we have this script modified to ignore single channel guests?