index-cert.js

const express = require("express");
const port = 8002;
const bodyParser = require("body-parser");
const router = express.Router();
var app = express();
var fs = require('fs');
const https = require('https');

// parse req body
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());
app.use("/", router);

app.post("/token", function (req, res) {
    expires_in = 60;
    access_token = Date.now() + expires_in * 1000;

    let cert = req.socket.getPeerCertificate();
    console.log(cert);
    if (req.client.authorized) {
        console.log(
            `Certificate is VALID`
        );
        if (req.body.grant_type === "client_credentials") {
            console.log(
                "/token",
                "Acquired tokens, will expire on ",
                new Date(access_token)
            );
        } else if (req.body.grant_type === "refresh_token") {
            console.log(
                "/token",
                "Refreshed tokens, will expire on ",
                new Date(access_token)
            );
        } else {
            res.sendStatus(400); // bad input
        }

        res_body = JSON.stringify({
            access_token,
            refresh_token: "refresh_token",
            expires_in,
            token_type: "Bearer",
        });
        console.log("res_body: ", res_body);
        res.send(res_body);
    }
    // The Certificate is NOT VALID
    else if (cert.subject) {
        console.log(
            `Certificates are NOT VALID`
        );
        res.sendStatus(403);
    }
    // A Certificate was NOT PROVIDED
    else {
        console.log(`No Certificate provided by the client`);
        res.status(403).send(`Certificate Required`);
    }
});

app.get("/check", function (req, res) {
    console.log("/check", "Received request");
    console.log("Token: ", req.headers.authorization);

    let cert = req.socket.getPeerCertificate();
    if (req.client.authorized) {
        console.log(
            `Certificate is VALID`
        );
        token_split = req.headers.authorization.replace("Bearer ", "");
        tokenDate = new Date(parseInt(token_split));

        if (Date.now() > tokenDate) {
            console.log("Token has expired, returning 401");
            res.sendStatus(401);
        } else {
            console.log("Token accepted");
            res.send(JSON.stringify({ status: "ok" }));
        }
    } else if (cert.subject) {
        // The Certificate is NOT VALID
        console.log(
            `Certificates are NOT VALID`
        );
        res.sendStatus(403);
    } else {
        // A Certificate was NOT PROVIDED
        console.log(`No Certificate provided by the client`);
        res.status(403).send(`Certificate Required`);
    }
});

var options = {
    key: fs.readFileSync('certs/server-key.pem'), 
    cert: fs.readFileSync('certs/server-crt.pem'), 
    ca: fs.readFileSync('certs/ca-crt.pem'), 
    requestCert: true, 
    rejectUnauthorized: true
};

https.createServer(options, app).listen(port, function () {
    console.log(`Example app listening on port ${port}!`);
    var route,
        routes = [];
    app._router.stack.forEach(function (middleware) {
        if (middleware.route) {
            // routes registered directly on the app
            routes.push(middleware.route);
        } else if (middleware.name === "router") {
            // router middleware
            middleware.handle.stack.forEach(function (handler) {
                route = handler.route;
                route && routes.push(route);
            });
        }
    });
    console.log(routes);
});