X-Git-Url: https://git.cworth.org/git?a=blobdiff_plain;f=lmno.js;h=65c317d05f37bb1b964781dd84b1b6d0f3b0f1ab;hb=e26d357ee7d6e689d098889de66d1c8c40482544;hp=dc23fc2556651626905bae6f10a47cf5fe227c3f;hpb=67ddcfdfc632fc081ae267d6482082ddfe1635aa;p=empires-server

diff --git a/lmno.js b/lmno.js
index dc23fc2..65c317d 100644
--- a/lmno.js
+++ b/lmno.js
@@ -1,9 +1,38 @@
 const express = require("express");
 const cors = require("cors");
 const body_parser = require("body-parser");
+const session = require("express-session");
+
+try {
+  var lmno_config = require("./lmno-config.json");
+} catch (err) {
+  config_usage();
+  process.exit(1);
+}
+
+function config_usage() {
+  console.log(`Error: Refusing to run without configuration.
+
+Please create a file named lmno-config.json that looks as follows:
+
+{
+  "session_secret": "<this should be a long string of true-random characters>";
+}
+
+Note: Don't use the exact text above, but instead replace the string
+with what it describes: a long string of random characters.`);
+}
 
 const app = express();
 app.use(cors());
+app.use(session({
+  secret: lmno_config.session_secret,
+  resave: false,
+  saveUninitialized: false
+}));
+
+/* Load each of our game mini-apps. */
+var empires = require("./empires");
 
 class LMNO {
   constructor() {
@@ -19,14 +48,15 @@ class LMNO {
       var id = this.generate_id();
     } while (id in this.ids);
 
-    const game = {
+    const game = new empires.Game();
+
+    this.ids[id] = {
 	id: id,
 	engine: engine,
+	game: game
     };
 
-    this.ids[id] = game;
-
-    return game;
+    return id;
   }
 }
 
@@ -42,12 +72,82 @@ LMNO.letters = "BCDFGHJKLMQRTVWXYZ";
 
 const lmno = new LMNO();
 
+/* Force a game ID into a canonical form as described above. */
+function lmno_canonize(id) {
+  /* Capitalize */
+  id = id.toUpperCase();
+
+  /* Replace unused letters with nearest phonetic match. */
+  id = id.replace(/N/g, 'M');
+  id = id.replace(/P/g, 'B');
+  id = id.replace(/S/g, 'F');
+
+  /* Replace unused numbers nearest visual match. */
+  id = id.replace(/0/g, 'O');
+  id = id.replace(/1/g, 'I');
+  id = id.replace(/5/g, 'S');
+
+  return id;
+}
+
 app.post('/new/:game_engine', (request, response) =>  {
   const game_engine = request.params.game_engine;
-  const game = lmno.create_game(game_engine);
-  response.send(JSON.stringify(game.id));
+  const game_id = lmno.create_game(game_engine);
+  response.send(JSON.stringify(game_id));
 });
 
+/* Redirect any requests to a game ID at the top-level.
+ *
+ * Specifically, after obtaining the game ID (from the path) we simply
+ * lookup the game engine for the corresponding game and then redirect
+ * to the engine- and game-specific path.
+ */
+app.get('/[a-zA-Z0-9]{4}', (request, response) => {
+  const game_id = request.path.replace(/\//g, "");
+  const canon_id = lmno_canonize(game_id);
+
+  /* Redirect user to page with the canonical ID in it. */
+  if (game_id !== canon_id) {
+    response.redirect(301, `/${canon_id}/`);
+    return;
+  }
+
+  const game = lmno.ids[game_id];
+  if (game === undefined) {
+      response.sendStatus(404);
+      return;
+  }
+  response.redirect(301, `/${game.engine}/${game.id}/`);
+});
+
+/* LMNO middleware to lookup the game. */
+app.use('/empires/:game_id([a-zA-Z0-9]{4})', (request, response, next) => {
+  const game_id = request.params.game_id;
+  const canon_id = lmno_canonize(game_id);
+
+  /* Redirect user to page with the canonical ID in it. */
+  if (game_id !== canon_id) {
+    const new_url = request.originalUrl.replace("/empires/" + game_id,
+                                                "/empires/" + canon_id);
+    response.redirect(301, new_url);
+    return;
+  }
+
+  /* See if there is any game with this ID. */
+  const game = lmno.ids[game_id];
+  if (game === undefined) {
+    response.sendStatus(404);
+    return;
+  }
+
+  /* Stash the game onto the request to be used by the game-specific code. */
+  request.game = game.game;
+  next();
+});
+
+/* Mount sub apps. only _after_ we have done all the middleware we need. */
+app.use('/empires/[a-zA-Z0-9]{4}/', empires.app);
+
 app.listen(4000, function () {
   console.log('LMNO server listening on localhost:4000');
 });