Remove Firebase hosting, back to Express

modules/actions/serveStats.js

@@ -0,0 +1,69 @@
+import { subDays, startOfDay, startOfSecond } from 'date-fns';
+
+import { getStats } from '../utils/stats';
+
+export default function serveStats(req, res) {
+  let since, until;
+  if (req.query.period) {
+    switch (req.query.period) {
+      case 'last-day':
+        until = startOfDay(new Date());
+        since = subDays(until, 1);
+        break;
+      case 'last-week':
+        until = startOfDay(new Date());
+        since = subDays(until, 7);
+        break;
+      case 'last-month':
+      default:
+        until = startOfDay(new Date());
+        since = subDays(until, 30);
+    }
+  } else {
+    if (!req.query.since) {
+      return res.status(403).send({ error: 'Missing ?since query parameter' });
+    }
+
+    if (!req.query.until) {
+      return res.status(403).send({ error: 'Missing ?until query parameter' });
+    }
+
+    since = new Date(req.query.since);
+    until = req.query.until
+      ? new Date(req.query.until)
+      : startOfSecond(new Date());
+  }
+
+  if (isNaN(since.getTime())) {
+    return res.status(403).send({ error: '?since is not a valid date' });
+  }
+
+  if (isNaN(until.getTime())) {
+    return res.status(403).send({ error: '?until is not a valid date' });
+  }
+
+  if (until <= since) {
+    return res
+      .status(403)
+      .send({ error: '?until date must come after ?since date' });
+  }
+
+  if (until >= new Date()) {
+    return res.status(403).send({ error: '?until must be a date in the past' });
+  }
+
+  getStats(since, until).then(
+    stats => {
+      res
+        .set({
+          'Cache-Control': 'public, max-age=3600', // 1 hour
+          'Cache-Tag': 'stats'
+        })
+        .send(stats);
+    },
+    error => {
+      console.error(error);
+      res.status(500).send({ error: 'Unable to fetch stats' });
+    }
+  );
+}