This bot will run the slack slash command and select a few words that are specified.
This bot runs as a web app within a Google app script.
You can make this bot work by registering it as a request URL for the Slack API slash command.

• When you let them choose a word

/choice keyword1 keyword2 keyword3

• npm
• clasp npm install -g @google/clasp
• apps-script-jobqueue
• make
• GAS Library
  • OAuth2
  • JobBroker

To use it, you need to set up Google apps scripts, and Slack API.

1. Enable Google Apps Script API
   https://script.google.com/home/usersettings
2. make push
3. make deploy
4. Grant the necessary privileges
   make open
   Publish > Deploy as web app.. > Update
   Grant access

The URL of the current web app after deployment will be used as the request URL for the OAuth authentication screen and Slack message action.

• Create New App
  https://api.slack.com/apps
  Please make a note of App Credentials displayed after registration.

In order to run the application and change its behavior, you need to set the following Google Apps scripts property.

1. Open Project
   $ make open
2. Add Scirpt properties
   File > Project properties > Scirpt properties > Add row
   Setting Property & Value

• Redirect URLs
  Add New Redirect URL > Add Redirect URL > Save URLs
  ex) https://script.google.com/macros/s/miserarenaiyo/usercallback
  You can check the Redirect URL in the following way. The RedirectUri of the displayed page.
  $ make application

• Bot Token Scopes
  Click Add an OAuth Scope to select the following permissions

  • commands
  • users:read

• Install App to Workspace
  You must specify a destination channel that bot can post to as an app.

1. Open web application
   $ make application
   The browser will be launched with the following URL:
   example) https://script.google.com/macros/s/miserarenaiyo/exec
2. Click Authorize.
   You must specify a destination channel that bot can post to as an app.
3. Click Allow
   The following message is displayed when OAuth authentication is successful

Success!
Setting EventSubscriptions
Setting Slash Commands
Setting Interactivity & Shortcuts

When prompted, click the Setting Slash Commands to set up an Slash Commands.

• Create New Command
  Setting Request URL.
  For example) https://script.google.com/macros/s/miserarenaiyo/exec