RPG-dice Slack integration (source)
Rolld is a Slack Integration that makes it easy to roll dice in a Slack Channel. That’s really all there is to it. I put this thing together in a few hours downtime when I needed to take a break from writing the book. I don’t plan to distribute it via Slack because I don’t want the dozens (there are dozens of us!) of Slack gamers banging on my free-tier Heroku dyno. But you can deploy your own Rolld app to a Heroku dyno and integrate it into a Slack channel of your choosing.
Roll + modifiers. Roll results are broken down inside the
 brackets and modifier is appended with a
Rolld also supports multiple rolls, eg:
Steps to Setup your own Rolld App
Steps to set up this integration for your local Slack channel, using a free dyno on Heroku to host:
- Clone the repo
git clone firstname.lastname@example.org:JaredHalpern/Rolld.git
- Make sure you have Homebrew installed. If not,
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
- Install the Heroku CLI:
brew install heroku/brew/heroku
- Verify Heroku CLI installation:
heroku --versionshould show you something like:
heroku/7.0.35 (darwin-x64) node-v10.0.0
- Ensure you’ve created an account at https://www.heroku.com. You can use the free-tier for now.
- Login to Heroku via command line:
- Change to the cloned Rolld directory:
- Set the Heroku buildpack:
heroku buildpacks:set heroku/python
- Create a heroku app:
heroku create. We’ll configure Slack to point to this URL soon. This command also creates a remote pointing to Heroku.
- Verify the remote is set up,
git remote -v. You should see something like:
heroku https://git.heroku.com/yass-rangers-61413.git (fetch)
heroku https://git.heroku.com/yass-rangers-61413.git (push)
- Go to Heroku Settings:
https://dashboard.heroku.com/apps/<your app name>/settingsand find the Domain. It should say something like:
Your app can be found at https://yass-rangers-61413.herokuapp.com/. Note down this url for the next step.
Create a Slack App
- Log into to your Slack account via the web: https://api.slack.com/apps
- Hit the Create New App button
- Name the app and choose a workspace in which to deploy it.
- In the
Add features and functionalitySection, Click
- Hit the
Create New Commandbutton.
- Enter the Command you’d like to use to invoke the integration.
- In Request URL, use the url from Step 11:
- Hit the Save button in the lower right.
- In the Install your app to your workspace section, hit the
Install App to Workspacebutton to install the integration. We’re not done yet though.
Verification / Permissioning
- Scroll down a bit further on the Basic Information page and copy the
Verification Token. Put it somewhere safe and temporary.
- Next click on OAuth & Permissions on the left-hand side. Copy the OAuth token and put it somewhere safe and temporary.
- This next part is a bit odd - we need to get the Team-ID. The best way to do that (that I’ve found) is to navigate to your team’s Slack channel in a web browser, then right-click and inspect the source. Find the text,
team_idand grab the value next to it. It’ll be something like
- We need to set the environmental variables. Best practices say that it’s a terrible idea to ever store things like tokens in source-control. We can do this via the Heroku command line, but I’ll show you how to do it in the Heroku CLI. Go to
https://dashboard.heroku.com/apps/<your app name>/settingsand tap the
Reveal Config Varsbutton. Enter the following Key-Value pairs:
SLACK_VERIFICATION_TOKEN | value from step 1 in this section,
SLACK_ROLLD_TOKEN | value from Step 2 in this section,
SLACK_TEAM_ID | value from step 3 in this section
- Alternatively, the Heroku CLI syntax for setting config variables:
heroku config:set SLACK_VERIFICATION_TOKEN=....your token....
- Push to the Heroku remote:
git push heroku master
- Open Slack, and run your command!
I’ve probably missed a step or two. If you see something, feel free to file a PR and I’ll update. Thanks!
Development and Testing
(Below is abbreviated and needs to be expanded upon and explained)
- Use ngrok for testing locally via “tunneling”.
- Instructions to set up ngrok specifically to test a Slack bot are [here]((https://api.slack.com/tutorials/tunneling-with-ngrok).
ngrok http 5000
- Ensure local ENV variables are set - either in
.bashrcor temporarily. Don’t forget to reload the terminal window if needed or source the
- Create a
virtualenvfor Rolld and run:
- With the activated
- Copy the url present in the
Forwardinginfo provided by
ngrokto the field
Request URL. This field is in: Your Apps -> (Features) Slash Commands -> (Click pencil to edit) Request URL. This will forward all calls from Slack to this URL, which happens be running locally on your machine.
- When done testing, don’t forget to set the Request URL back to your Heroku App’s URL.
Thanks to Justin Isaf, jisaf for adding modifiers.