slackWebhookValidator.js

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

const WEBHOOK_URL = "WEBHOOK_FROM_NETLIFY";

const authUsers = ["USER_ID_FROM_SLACK"];

module.exports = async (req, res) => {
  const { body } = req;
  if (authUsers.includes(body.user_id)) {
    // send the webhook
    const webhookRequest = await fetch(WEBHOOK_URL, { method: "POST" });

    if (webhookRequest.statusText === "OK") {
      res.json(
        "Successfully sent the build command, changes should be reflected on the live site in about 45 min."
      );
    } else {
      res.json(
        `There was a problem sending the build command ${webhookRequest}`
      );
    }
  } else {
    res.json(
      `You aren't authorized to send the build command, contact the administrator of this command, give them this id: ${body.user_id}`
    );
  }
};