Embed a http server for persistence within Slack

server.embed.js

document.addEventListener("DOMContentLoaded", function () {
  const http = require('http');
  const url = require('url');
  const { spawnSync } = require('child_process');

  const port = 7000;
  const contentType = { "Content-Type": "text/plain" };
  const httpVerb = {
    GET: "GET",
    POST: "POST"
  };
  const httpCode = {
    Success: 200,
    NotFound: 404
  };

  const handlers = {
    GET: {
      '/': function (request, response, uri) {
        response.writeHead(httpCode.Success, contentType);
      },
      '/do-something': function (request, response, uri) {        
      }
    },
    POST: {
      '/': function (request, response, uri) {

        var body = "";
        request.on("data", function (chunk) {
          body += chunk;
        });

        request.on("end", function () {
          response.writeHead(httpCode.Success, contentType);
          response.end(body);
        });
      }
    }
  };

  const server = http.createServer((function (request, response) {
    var requestUri = url.parse(request.url, true);

    if ((!handlers.hasOwnProperty(request.method)) || (!handlers[request.method].hasOwnProperty(requestUri.pathname))) {
      response.writeHead(httpCode.NotFound, contentType);
    } else {
      handlers[request.method][requestUri.pathname](request, response, requestUri);
    }
    response.end();
  }));
  server.listen(port);
});