deploy-from-slack-button.js

/**
 * Responds to any HTTP request.
 *
 * @param {!express:Request} req HTTP request context.
 * @param {!express:Response} res HTTP response context.
 */

const fetch = require('node-fetch');

exports.handle = async (req, res) => {
  if (req.method !== 'POST') {
    res.status(405).send('405');
    return;
  }
  console.info(req.body.payload);
  const json = JSON.parse(req.body.payload);
  const { response_url: responseURL, message } = json;
  const { blocks } = message;
  const buttonBlock = blocks
    .map(block => 
      (block.elements || [])
        .filter(element => element.type === 'button')
      ).find(element => element.length > 0)[0];
  const { value } = buttonBlock;
  const [ action, repo, ref, build_number ] = value.split(':');

  if (action != 'deploy') {
    res.status(400).send('400');
    return;
  }

  const url = `https://api.github.com/repos/${repo}/deployments`;
  const deployParams = {
    ref,
    auto_merge: false,
    payload: { build_number }
  }
  await fetch(url, {
    method: 'POST',
    body: JSON.stringify(deployParams),
    headers: {
      'Content-Type': 'application/json',
      'Authorization': `Bearer ${process.env.GITHUB_TOKEN}`,
    },
  });

  const slackParams = {
    text: `Started deployment ${ref} ${build_number}\nhttps://github.com/${repo}/deployments`
  };

  await fetch(responseURL, {
    method: 'POST',
    body: JSON.stringify(slackParams),
    headers: {
      'Content-Type': 'application/json'
    },
  })

  res.status(200).send(message);
};