server.js

/** TechLead is so cool!!! He knows da wae!!! https://www.youtube.com/c/TechLead ***************************************
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***********************************************************************************************************************/

const { v4: uuidv4 } = require('uuid');

const express = require('express');
const expressStaticGzip = require("express-static-gzip");
const app = express();
const http = require('http');
const server = http.createServer(app);
const _debug = require('debug');
const compression = require('compression');
const requireDir = require("requiredir");
const controllers = requireDir('./controllers');
let Controllers = {};
debug = _debug("liongov");
debug('Debugging liongov');

const ethers = require('ethers');
const c = require('./public/constants');
const blkchain = require('./libs/blockchain');
const Moralis = require('moralis/node');
const IPFS = require('ipfs-core')

const AWS = require("aws-sdk");

dynamoDB = new AWS.DynamoDB(); // Global scope

ipfs = null; // Global scope
IPFS.create().then( e => {ipfs = e});

Moralis.initialize(process.env.MORALIS_APP_ID);

Moralis.serverURL = process.env.MORALIS_SERVER_URL;

Blkchain = new blkchain(Moralis); // Global scope

if(process.env.NODE_ENV == 'development'){
  // Allows CROS to development, it's necessary to debug frontend with backend.
  app.use(function(req, res, next) {
    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
    next();
  });
}

// Sends precompressed files whenever possible
app.use("/", expressStaticGzip("dist/", {
    enableBrotli: true,
    orderPreference: ['br', 'gz']
}));
// Compress on the fly all the rest.
app.use(compression());

app.use(express.static('public'))

// body-parser is deprecated, using below instead: https://stackoverflow.com/questions/66525078/bodyparser-is-deprecated
app.use(express.urlencoded({ extended: true }));
app.use(express.json()) // To parse the incoming requests with JSON payloads


app.get('/', (req, res) => {
  res.send('Hello World!');
});

app.get('/healthcheck.html', (req, res) => {
  res.send('Health check!');
});

let controller_this = {Blkchain, dynamoDB, _debug}; //Obj that will be accessible in controller 'this'

// Load routes and controllers

Object.keys(controllers).forEach((Contr_name) => {
  if(Contr_name == "length" || Contr_name == "toArray"){return;}
  controller_this.debug = debug.extend(Contr_name);
  Controller = Controllers[Contr_name] = new controllers[Contr_name](controller_this);
  let namel = Contr_name.toLowerCase();
  if(Controller.get) {
    app.get('/' + namel, Controller.get);
  }
  if(Controller.post) {
    app.post('/' + namel, Controller.post);
  }
});

// Some prerender to get Proposal title in social links
app.get('/proposal/:uid', Controllers.proposal.get);


// TODO: add filtering/validation on all the APIS. In particular, want to prevent database injection attacks
// TOOD: add API throttling (e.g. by IP address), there are various libraries for that
// TODO: add DDOS protection (e.g. AWS provides some services for this). We can do this after we add a load balancer.

// TODO: show error to client when voting twice

//Redirect all left routes to React
app.get('*', function(req, res){
  res.sendFile(__dirname + '/dist/index.html');
});

server.listen(3000, () => {
  console.log('listening on *:3000');

  Controllers.privacyVoteQuery._privacyVoteQuery({
    voteClass: 'matrix'
  }, () => {

  });
});