Linear.app Slack Bot Autolinker

README.md

This is a Slack bot that automatically links to Linear.app issues. Sort of how like the Github autolinks work, except for Slack.

For example, you type Check out SE-12, the bot will then link to https://linear.app/{team}/se-12

app.js

const { App, ExpressReceiver } = require('@slack/bolt');
const serverlessExpress = require('@vendia/serverless-express');

// Define team prefixes here
const TEAM_PREFIXES = ['SE'];
// Define linear team
const LINEAR_TEAM = `fsf`;

// ----- That's pretty much it...
const LINEAR_LINK = `https://linear.app/${LINEAR_TEAM}/issue`

const expressReceiver = new ExpressReceiver({
  signingSecret: process.env.SLACK_SIGNING_SECRET,
  processBeforeResponse: true
});

const app = new App({
  token: process.env.SLACK_BOT_TOKEN,
  receiver: expressReceiver
});

const regexp = buildRegex();

app.message(regexp, sendLink);

async function sendLink({ message, context, say }) {
  const issue = context.matches[0];
  // @todo- validate that the issue is valid based on team provided.
  // for example, if team is 'se' and an issue that was found in context was se- (no number),
  // it should error. should always check against length of the actual team prefix as well.

  const text = `${LINEAR_LINK}/${issue}`
  let thread_ts = message.ts

  if (message.thread_ts) {
    thread_ts = message.thread_ts 
  }

  await say({text, thread_ts});
}

function buildRegex() {
  // match prefixes with upper and lowercase values
  const matches = TEAM_PREFIXES.map(s => s.toUpperCase()).join('|') + "|" + TEAM_PREFIXES.map(s => s.toLowerCase()).join('|')

  // We only care about the first match, no need for a global identifier
  const r = `(${matches})-(.*?)[0-9]*`

  return new RegExp(r)
}

module.exports.handler = serverlessExpress({
  app: expressReceiver.app
});