1 const express = require("express");
2 const cors = require("cors");
3 const body_parser = require("body-parser");
4 const session = require("express-session");
5 const bcrypt = require("bcrypt");
6 const path = require("path");
7 const nunjucks = require("nunjucks");
10 var lmno_config = require("./lmno-config.json");
16 function config_usage() {
17 console.log(`Error: Refusing to run without configuration.
19 Please create a file named lmno-config.json that looks as follows:
22 "session_secret": "<this should be a long string of true-random characters>",
24 "username": "<username>",
25 "password_hash_bcrypt": "<password_hash_made_by_bcrypt>"
29 Note: Of course, change all of <these-parts> to actual values desired.
31 The "node lmno-passwd.js" command can help generate password hashes.`);
34 const app = express();
36 app.use(body_parser.urlencoded({ extended: false }));
37 app.use(body_parser.json());
39 secret: lmno_config.session_secret,
41 saveUninitialized: false
44 nunjucks.configure("templates", {
49 /* Load each of our game mini-apps. */
50 var empires = require("./empires");
58 return [null,null,null,null].map(() => LMNO.letters.charAt(Math.floor(Math.random() * LMNO.letters.length))).join('');
63 var id = this.generate_id();
64 } while (id in this.ids);
66 const game = new empires.Game();
78 /* Some letters we don't use in our IDs:
80 * 1. Vowels (AEIOU) to avoid accidentally spelling an unfortunate word
81 * 2. Lowercase letters (replace with corresponding capital on input)
82 * 3. N (replace with M on input)
83 * 4. P (replace with B on input)
84 * 5. S (replace with F on input)
86 LMNO.letters = "BCDFGHJKLMQRTVWXYZ";
88 const lmno = new LMNO();
90 /* Force a game ID into a canonical form as described above. */
91 function lmno_canonize(id) {
93 id = id.toUpperCase();
95 /* Replace unused letters with nearest phonetic match. */
96 id = id.replace(/N/g, 'M');
97 id = id.replace(/P/g, 'B');
98 id = id.replace(/S/g, 'F');
100 /* Replace unused numbers nearest visual match. */
101 id = id.replace(/0/g, 'O');
102 id = id.replace(/1/g, 'I');
103 id = id.replace(/5/g, 'S');
108 app.post('/new/:game_engine', (request, response) => {
109 const game_engine = request.params.game_engine;
110 const game_id = lmno.create_game(game_engine);
111 response.send(JSON.stringify(game_id));
114 /* Redirect any requests to a game ID at the top-level.
116 * Specifically, after obtaining the game ID (from the path) we simply
117 * lookup the game engine for the corresponding game and then redirect
118 * to the engine- and game-specific path.
120 app.get('/[a-zA-Z0-9]{4}', (request, response) => {
121 const game_id = request.path.replace(/\//g, "");
122 const canon_id = lmno_canonize(game_id);
124 /* Redirect user to page with the canonical ID in it. */
125 if (game_id !== canon_id) {
126 response.redirect(301, `/${canon_id}/`);
130 const game = lmno.ids[game_id];
131 if (game === undefined) {
132 response.sendStatus(404);
135 response.redirect(301, `/${game.engine}/${game.id}/`);
138 /* LMNO middleware to lookup the game. */
139 app.use('/empires/:game_id([a-zA-Z0-9]{4})', (request, response, next) => {
140 const game_id = request.params.game_id;
141 const canon_id = lmno_canonize(game_id);
143 /* Redirect user to page with the canonical ID in it. */
144 if (game_id !== canon_id) {
145 const new_url = request.originalUrl.replace("/empires/" + game_id,
146 "/empires/" + canon_id);
147 response.redirect(301, new_url);
151 /* See if there is any game with this ID. */
152 const game = lmno.ids[game_id];
153 if (game === undefined) {
154 response.sendStatus(404);
158 /* Stash the game onto the request to be used by the game-specific code. */
159 request.game = game.game;
163 function auth_admin(request, response, next) {
164 /* If there is no user associated with this session, redirect to the login
165 * page (and set a "next" query parameter so we can come back here).
167 if (! request.session.user) {
168 response.redirect(302, "/login?next=" + request.path);
172 /* If the user is logged in but not authorized to view the page then
173 * we return that error. */
174 if (request.session.user.role !== "admin") {
175 response.status(401).send("Unauthorized");
181 app.get('/logout', (request, response) => {
182 request.session.user = undefined;
183 request.session.destroy();
185 response.send("You are now logged out.");
188 app.get('/login', (request, response) => {
189 if (request.session.user) {
190 response.send("Welcome, " + request.session.user + ".");
194 response.render('login.html');
197 app.post('/login', async (request, response) => {
198 const username = request.body.username;
199 const password = request.body.password;
200 const user = lmno_config.users[username];
202 response.sendStatus(404);
205 const match = await bcrypt.compare(password, user.password_hash_bcrypt);
207 response.sendStatus(404);
210 request.session.user = { username: user.username, role: user.role };
211 response.sendStatus(200);
215 /* API to set uer profile information */
216 app.put('/profile', (request, response) => {
217 const nickname = request.body.nickname;
219 request.session.nickname = nickname;
220 request.session.save();
225 /* An admin page (only available to admin users, of course) */
226 app.get('/admin/', auth_admin, (request, response) => {
230 for (let id in lmno.ids) {
231 if (lmno.ids[id].game.clients.length)
232 active.push(lmno.ids[id]);
234 idle.push(lmno.ids[id]);
236 response.render('admin.html', { test: "foobar", games: { active: active, idle: idle}});
240 /* Mount sub apps. only _after_ we have done all the middleware we need. */
241 app.use('/empires/[a-zA-Z0-9]{4}/', empires.app);
243 app.listen(4000, function () {
244 console.log('LMNO server listening on localhost:4000');