app.js

// load config file before loading other modules
const config = require(`./lib/config`);

// load modules
const authenticate = require('./lib/rest/middleware/authenticate');
const bodyParser   = require('body-parser');
const createServer = require('./lib/server');
const createSocket = require('./lib/socket');
const error        = require('./lib/rest/middleware/error');
const errors       = require('./lib/rest/errors');
const express      = require('express');
const helmet       = require('helmet');
const limiter      = require('./lib/rest/middleware/limit');
const route        = require('./lib/rest/router');
const routeSocket  = require('./lib/socket/router');
const type         = require('./lib/rest/middleware/type');

// initialize Express and routers
const app = express();               // create the Express app
const v0  = express.Router();        // create the Version 0.x router

// app settings
app.enable(`trust proxy`);           // trust the Azure proxy server
app.set(`port`, config.port);        // set port for the app

// middleware
app.use(helmet());                   // basic security features
app.use(limiter);                    // rate limiting
app.use(bodyParser.json());          // parse JSON data in the request body
app.use(express.static(`public`));   // routing for static files
app.use(error);                      // adds res.error method to response
if (config.logInfo) {                // log requested URLs
  const logger = require('./lib/rest/middleware/logger');
  app.use(logger);
}
app.use(type);                       // set req.type
app.use(authenticate.unless({        // authenticate requests to the API
  path: [/\/test\//],                // don't authenticate test routes
}));

// add routes to routers
route(v0);

// mount routers to their respective version paths
app.use(v0);
app.use(`/v0`, v0);

// add generic error handlers
app.use(errors.notFound);
app.use(errors.serverError);

const server = createServer(app);    // create the server
const io     = createSocket(server); // create the socket

// add routes to sockets
routeSocket(io.of(`/`));
routeSocket(io.of(`/v0`));

app.io         = io;                 // add IO to app (makes it available to request handlers)
module.exports = app;                // export app for testing