redux-devtools/packages/redux-devtools-cli/src/routes.js

var path = require('path');
var express = require('express');
var morgan = require('morgan');
var bodyParser = require('body-parser');
var cors = require('cors');
var graphiqlMiddleware = require('./middleware/graphiql');
var graphqlMiddleware = require('./middleware/graphql');

var app = express.Router();

function serveUmdModule(name) {
  app.use(express.static(require.resolve(name).match(/.*\/(node_modules|packages)\/[^/]+\//)[0] + 'umd'));
}

function routes(options, store) {
  var limit = options.maxRequestBody;
  var logHTTPRequests = options.logHTTPRequests;
  
  if (logHTTPRequests) {
    if (typeof logHTTPRequests === 'object') app.use(morgan('combined', logHTTPRequests));
    else app.use(morgan('combined'));
  }

  app.use('/graphiql', graphiqlMiddleware);

  serveUmdModule('react');
  serveUmdModule('react-dom');
  serveUmdModule('redux-devtools-core');

  app.get('/port.js', function (req, res) {
    res.send('reduxDevToolsPort = ' + options.port);
  });
  app.get('*',  function (req, res) {
    res.sendFile(path.join(__dirname, '../app/index.html'));
  });

  app.use(cors({methods: 'POST'}));
  app.use(bodyParser.json({limit: limit}));
  app.use(bodyParser.urlencoded({limit: limit, extended: false}));

  app.use('/graphql', graphqlMiddleware(store));

  app.post('/', function (req, res) {
    if (!req.body) return res.status(404).end();
    switch (req.body.op) {
      case 'get':
        store.get(req.body.id).then(function (r) {
          res.send(r || {});
        }).catch(function (error) {
          console.error(error);
          res.sendStatus(500)
        });
        break;
      case 'list':
        store.list(req.body.query, req.body.fields).then(function (r) {
          res.send(r);
        }).catch(function (error) {
          console.error(error);
          res.sendStatus(500)
        });
        break;
      default:
        store.add(req.body).then(function (r) {
          res.send({id: r.id, error: r.error});
          scServer.exchange.publish('report', {
            type: 'add', data: r
          });
        }).catch(function (error) {
          console.error(error);
          res.status(500).send({})
        });
    }
  });
  return app;
}

module.exports = routes;