Fix sitemap

Add 24 hour cache
Add jobs to sitemap
Possible warning about to many eventemitter listeners

server/boot/sitemap.js

@@ -0,0 +1,64 @@
+import moment from 'moment';
+import { Scheduler, Observable } from 'rx';
+import { timeCache, observeQuery } from '../utils/rx';
+import { dasherize } from '../utils';
+
+const cacheTimeout = [ 24, 'hours' ];
+const appUrl = 'https://www.freecodecamp.com';
+
+// getCachedObservable(
+//   app: ExpressApp,
+//   modelName: String,
+//   nameProp: String,
+//   map: (nameProp: String) => String
+// ) => Observable[models]
+function getCachedObservable(app, modelName, nameProp, map) {
+  return observeQuery(
+    app.models[modelName],
+    'find',
+    { fields: { [nameProp]: true } }
+  )
+    .flatMap(models => {
+      return Observable.from(models, null, null, Scheduler.default);
+    })
+    .filter(model => !!model[nameProp])
+    .map(model => model[nameProp])
+    .map(map ? map : (x) => x)
+    .toArray()
+    ::timeCache(cacheTimeout[0], cacheTimeout[1]);
+}
+
+export default function sitemapRouter(app) {
+  const router = app.loopback.Router();
+  const challenges$ = getCachedObservable(app, 'Challenge', 'dashedName');
+  const stories$ = getCachedObservable(app, 'Story', 'storyLink', dasherize);
+  const jobs$ = getCachedObservable(app, 'Job', 'id');
+  function sitemap(req, res, next) {
+    const now = moment(new Date()).format('YYYY-MM-DD');
+    return Observable.combineLatest(
+      challenges$,
+      stories$,
+      jobs$,
+      (
+        challenges,
+        stories,
+        jobs
+      ) => ({ challenges, stories, jobs })
+    )
+      .subscribe(
+        ({ challenges, stories, jobs }) => {
+          res.header('Content-Type', 'application/xml');
+          res.render('resources/sitemap', {
+            appUrl,
+            now,
+            challenges,
+            stories,
+            jobs
+          });
+        },
+        next
+      );
+  }
+  router.get('/sitemap.xml', sitemap);
+  app.use(router);
+}