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_id = lmno.create_game(game_engine);
*/
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) {
/* LMNO middleware to lookup the game. */
app.use('/empires/:game_id([a-zA-Z0-9]{4})', (request, response, next) => {
- request.game = lmno.ids[request.params.game_id].game;
+ 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;
+ }
+
+ request.game = lmno.ids[game_id].game;
if (request.game === undefined) {
response.sendStatus(404);
return;