feat(clk-gateway): keep set of names reserved (#71)

Author: Alex Sedighi

clk-gateway/package.json

@@ -13,12 +13,14 @@
     "firebase": "^11.0.2",
     "firebase-admin": "^13.0.1",
     "typescript": "^5.7.2",
+    "validator": "^13.12.0",
     "zksync-ethers": "^6.15.1"
   },
   "devDependencies": {
     "@types/cors": "^2.8.17",
     "@types/express": "^5.0.0",
     "@types/jest": "^29.5.14",
+    "@types/validator": "^13.12.2",
     "jest": "^29.7.0",
     "nodemon": "^3.1.7",
     "prettier": "^3.3.3",
@@ -32,6 +34,7 @@
     "dev": "nodemon src/index.ts",
     "build": "tsc",
     "serve": "yarn build && yarn start",
-    "createToken": "ts-node src/createToken.ts"
+    "createToken": "ts-node src/createToken.ts",
+    "createReservedNameHashes": "ts-node src/reservedNames.ts"
   }
 }

clk-gateway/src/index.ts

@@ -34,6 +34,7 @@ import {
   cnsTld,
 } from "./setup";
 import { getBatchInfo } from "./helpers";
+import reservedHashes from "./reservedHashes";
 
 const app = express();
 app.use(express.json());
@@ -303,16 +304,24 @@ app.post(
   "/registerL2",
   [
     body("name")
+      .isLowercase()
+      .withMessage("Name must be a lowercase string")
       .isFQDN()
       .withMessage("Name must be a fully qualified domain name")
       .custom((name) => {
         const [sub, domain, tld] = name.split(".");
         if (domain !== cnsDomain || tld !== cnsTld) {
           return false;
         }
+
+        const subHash = keccak256(toUtf8Bytes(sub));
+        if (reservedHashes.includes(subHash)) {
+          return false;
+        }
+
         return true;
       })
-      .withMessage("Invalid domain or tld"),
+      .withMessage("Invalid domain or tld or reserved subdomain"),
     body("owner")
       .isString()
       .custom((owner) => {