Core synchronous queue with an example worker

routes/index.js

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+const dotenv = require('dotenv')
+const express = require('express')
+const statusCodes = require('http-status-codes').StatusCodes
+const createError = require('http-errors')
+
+dotenv.config()
+
+const router = express.Router()
+
+// TODO: Add a mechanism for multiple clients/API keys
+const apiKeys = [
+  process.env.API_KEY
+]
+
+// Middleware to verify API access is granted
+router.use('/', function(req, res, next){
+  var key = req.query['api_key'];
+
+  // key isn't present
+  if (!key) {
+    return next(createError(statusCodes.BAD_REQUEST, 'api key required'))
+  }
+
+  // key is invalid
+  if (!~apiKeys.indexOf(key)) {
+    return next(createError(statusCodes.UNAUTHORIZED, 'invalid api key'))
+  }
+
+  // all good, store req.key for route access
+  req.key = key
+  next()
+})
+
+// Add API routes to default router
+router.use('/', require('./calc-queue.js'))
+
+module.exports = router