Begin implementing a reporting mechanism

server/routes/report.js

@@ -0,0 +1,39 @@
+const storage = require('../storage');
+const Keychain = require('../keychain');
+const { statReportEvent } = require('../amplitude');
+
+module.exports = async function(req, res) {
+  try {
+    const id = req.params.id;
+    const meta = await storage.metadata(id);
+    if (meta.flagged) {
+      return res.sendStatus(200);
+    }
+    try {
+      const key = req.body.key;
+      const keychain = new Keychain(key);
+      const metadata = await keychain.decryptMetadata(
+        Buffer.from(meta.metadata, 'base64')
+      );
+      if (metadata.manifest) {
+        storage.flag(id, key);
+        statReportEvent({
+          id,
+          ip: req.ip,
+          owner: meta.owner,
+          reason: req.body.reason,
+          download_limit: meta.dlimit,
+          download_count: meta.dl,
+          agent: req.ua.browser.name || req.ua.ua.substring(0, 6)
+        });
+        return res.sendStatus(200);
+      }
+      res.sendStatus(400);
+    } catch (e) {
+      console.error(e);
+      res.sendStatus(400);
+    }
+  } catch (e) {
+    res.sendStatus(404);
+  }
+};