NodeJS Function to Purge Fastly CDN by Zesty ZUID

fastly-purge-cloud-function.js

var corsOptions = {
  origin: function(origin, callback) {
    if (whitelist.indexOf(origin) !== -1) {
      callback(null, true);
    } else {
      callback(new Error("Not allowed by CORS"));
    }
  }
};

require('env-yaml').config({ path: '.env.yaml' })

exports.fastlyPurge = (req, res) => {
  const cors = require("cors")();

  cors(req, res, () => {

      exportFastlyPurge(req, res);

  });
};

const exportFastlyPurge = async (req, res) => {
   // error handling
  if (req.method !== "GET") {
    return res.status(400).send("Error: expected HTTP GET.");
  }

  let cacheKey = req.query.hasOwnProperty("zuid") ? req.query.zuid : false;

  if(!cacheKey){
        return res.status(400).send("Error: expected query param 'zuid'. Add ?zuid=7-XXXXX-XXXXXXX to the end of this url");
  }

  var fastly = require('fastly')(process.env.FASTLY_KEY);

  fastly.purgeKey(process.env.FASTLY_SERVICE, cacheKey, function (err, obj) {

      if (err) return res.send(err)   // Oh no!
      res.send(obj);                   // Response body from the fastly API
  });

}