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server.js
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server.js
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// Importing npm modules
const express = require("express");
const dotenv = require("dotenv");
const flash = require("connect-flash");
const session = require("express-session");
const cookie = require("cookie-parser");
const Web3 = require("web3");
// Importing built-in modules
const path = require("path");
// Importing routers
const homeRouter = require("./routers/homeRouter");
const voterRouter = require("./routers/voterRouter");
const adminRouter = require("./routers/adminRouter");
// Importing database config
const { initDB } = require("./config/database");
// Importing smart contract
const Election = require("./build/contracts/Election.json");
// Fetching environment variables
dotenv.config();
const PORT = process.env.PORT || 3000;
const SESSION_SECRET = process.env.SESSION_SECRET || "This_is_my_secret_key";
const GANACHE_URI = process.env.GANACHE_URI || "http://localhost:7545";
// Express app instance
const app = express();
/*
MOUNTING MIDDLEWARE FUNCTIONS
TO EXPRESS APP INSTANCE
*/
// Middleware for recognizing incoming request object as JSON
app.use(express.json());
// Middleware to set static path at /public
app.use(express.static(path.join(__dirname, "/public/")));
// Express body parser middleware
app.use(express.urlencoded({ extended: true }));
// Flash middleware
app.use(flash());
// Cookie parser middleware
app.use(cookie());
// Express session middleware
app.use(
session({
secret: SESSION_SECRET,
resave: true,
saveUninitialized: true,
})
);
// Disabling X-powered-by for security reasons
app.disable("x-powered-by");
// Setting EJS as view engine
app.set("view engine", "ejs");
// Middleware to set global variables
app.use((req, res, next) => {
res.locals.success_msg = req.flash("success_msg");
res.locals.error_msg = req.flash("error_msg");
res.locals.error = req.flash("error");
next();
});
// MongoDB Connection
initDB();
// Web3 Connection
const web3 = new Web3(GANACHE_URI);
let election;
let adminAddress;
// Smart contract instance
const initContract = async () => {
const networkId = await web3.eth.net.getId();
const deployedNetwork = Election.networks[networkId];
// Smart contract instance
election = new web3.eth.Contract(Election.abi, deployedNetwork.address);
global.election = election;
// Admin account address
const addresses = await web3.eth.getAccounts();
adminAddress = addresses[0];
global.adminAddress = adminAddress;
};
global.web3 = web3;
initContract();
/*
HANDLING ROUTES
*/
// Home routes
app.use("/", homeRouter);
// Voter routes
app.use("/voter", voterRouter);
// Admin routes
app.use("/admin", adminRouter);
// Error routes
app.use((req, res, next) => {
res.status(404).render("404");
});
// Serving and listening at PORT
app.listen(PORT, () => {
console.log(`Listening to http://localhost:${PORT}`);
});