added /api/info/:id route

server/routes/info.js

@@ -0,0 +1,31 @@
+const storage = require('../storage');
+
+function validateID(route_id) {
+  return route_id.match(/^[0-9a-fA-F]{10}$/) !== null;
+}
+
+module.exports = async function(req, res) {
+  const id = req.params.id;
+  if (!validateID(id)) {
+    return res.sendStatus(404);
+  }
+  const ownerToken = req.body.owner_token;
+  if (!ownerToken) {
+    return res.sendStatus(400);
+  }
+
+  try {
+    const meta = await storage.metadata(id);
+    if (meta.owner !== ownerToken) {
+      return res.sendStatus(400);
+    }
+    const ttl = await storage.ttl(id);
+    return res.send({
+      dlimit: meta.dlimit,
+      dtotal: meta.dl,
+      ttl
+    });
+  } catch (e) {
+    res.sendStatus(404);
+  }
+};