server.js

// Hospital Management System
// CSE2004 Project 2021
// Vellore Institute of Technology, Chennai

let isDebug = true;
if (process.env.PORT) isDebug = false;
else require("dotenv").config({ path: __dirname + "/.env" });

const express = require("express");
const session = require("express-session");
const helmet = require("helmet");
const flash = require("express-flash");
const cookieParser = require("cookie-parser");

const passport = require("passport");
const { initializePassport } = require("./passport-config");
initializePassport(passport);

const app = express();
const port = process.env.PORT || 8082;

// database function
const { init, getHospitalByName } = require("./database.js");

// other routes
let patientRoutes = require("./patientRoutes");
let doctorRoutes = require("./doctorRoutes");
let adminRoutes = require("./adminRoutes");

app.set("view engine", "ejs");
app.use(express.urlencoded({ extended: true }));
app.use(express.json());
app.use(cookieParser(process.env.SESSION_SECRET));
app.use(flash());
app.use(helmet({
    contentSecurityPolicy: false
}));

app.use("/favicons", express.static("favicons"));

let hospital = { name: "City Hospital", address: "India", phone: "0832 - 2123456" };

if (process.env.NODE_ENV == "production") {
    app.use((req, res, next) => {
        if (req.headers["x-forwarded-proto"] !== "https") {
            return res.redirect(["https://", req.get("Host"), req.url].join(""));
        }
        return next();
    });
}

app.use(session({
    secret: process.env.SESSION_SECRET,
    resave: false,
    saveUninitialized: false
}));
app.use(passport.initialize());
app.use(passport.session());
app.use(function (req, res, next) {
    res.header("Cache-Control", "no-cache, private, no-store, must-revalidate, max-stale=0, post-check=0, pre-check=0");
    next();
});

Object.defineProperty(String.prototype, "toProperCase", {
    value: function () {
        return this.replace(/([^\W_]+[^\s-]*) */g, (txt) => txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase());
    }
});



const renderTemplate = async (req, res, template, data = {}) => {
    const baseData = {
        path: req.path || null,
        user: req.isAuthenticated() ? req.user : null,
        hospital
    };
    return res.render(template, Object.assign(baseData, data));
};

//main landing page
app.get("/", (req, res) => {
    renderTemplate(req, res, "pages/patient/index");
});

patientRoutes(app, passport, renderTemplate);
doctorRoutes(app, passport, renderTemplate);
adminRoutes(app, passport, renderTemplate);

// handle 404
app.get("/404", (req, res) => {
    renderTemplate(req, res, "pages/404");
});

app.get("/about", (req, res) => {
    renderTemplate(req, res, "pages/about");
});

app.get("*", (req, res) => {
    return res.redirect("/404");
});

app.listen(port, () => {
    if (isDebug) console.log(`Project running on http://localhost:${port}`);
    else console.log("Project running on https://hms-product.herokuapp.com");
});

// Connecting to database
// and getting current hospital information
(async () => {
    if (process.env.DATABASE_URL) {
        await init();
        (async () => {
            hospital = await getHospitalByName("City Hospital");
        })();
    } else {
        throw new Error("No database URL provided in env.");
    }
})();