Rename server => modules

modules/middleware/validateQuery.js

@@ -0,0 +1,34 @@
+const createSearch = require("../utils/createSearch");
+
+const knownQueryParams = {
+  main: true, // Deprecated, see #63
+  meta: true,
+  module: true
+};
+
+function isKnownQueryParam(param) {
+  return !!knownQueryParams[param];
+}
+
+function sanitizeQuery(originalQuery) {
+  const query = {};
+
+  Object.keys(originalQuery).forEach(param => {
+    if (isKnownQueryParam(param)) query[param] = originalQuery[param];
+  });
+
+  return query;
+}
+
+/**
+ * Reject URLs with invalid query parameters to increase cache hit rates.
+ */
+function validateQuery(req, res, next) {
+  if (!Object.keys(req.query).every(isKnownQueryParam)) {
+    return res.redirect(302, req.path + createSearch(sanitizeQuery(req.query)));
+  }
+
+  next();
+}
+
+module.exports = validateQuery;