js: allow separate fee payer in createSub

js/src/bindings.ts

@@ -407,12 +407,14 @@ export const createReverseName = async (
  * @param subdomain The subdomain to create with or without .sol e.g something.bonfida.sol or something.bonfida
  * @param owner The owner of the parent domain creating the subdomain
  * @param space The space to allocate to the subdomain (defaults to 2kb)
+ * @param feePayer Optional: Specifies a fee payer different from the parent owner
  */
 export const createSubdomain = async (
   connection: Connection,
   subdomain: string,
   owner: PublicKey,
   space = 2_000,
+  feePayer?: PublicKey,
 ) => {
   const ixs: TransactionInstruction[] = [];
   const sub = subdomain.split(".")[0];
@@ -431,7 +433,7 @@ export const createSubdomain = async (
     connection,
     "\0".concat(sub),
     space, // Hardcode space to 2kB
-    owner,
+    feePayer || owner,
     owner,
     lamports,
     undefined,
@@ -446,7 +448,7 @@ export const createSubdomain = async (
     const [, ix_reverse] = await createReverseName(
       pubkey,
       "\0".concat(sub),
-      owner,
+      feePayer || owner,
       parent,
       owner,
     );

js/tests/reverse.test.ts

@@ -18,7 +18,7 @@ test("Create sub", async () => {
     connection,
     sub + "." + parent,
     parentOwner,
-    1_000
+    1_000,
   );
   const tx = new Transaction();
   tx.add(...ix);

js/tests/sub.test.ts

@@ -5,6 +5,7 @@ import { createSubdomain, transferSubdomain } from "../src/bindings";
 import { randomBytes } from "crypto";
 import { VAULT_OWNER } from "../src/constants";
 import { findSubdomains, getDomainKeySync } from "../src/utils";
+import { resolve } from "../src/resolve";
 
 jest.setTimeout(20_000);
 
@@ -68,3 +69,26 @@ test("Find sub domain", async () => {
   const expectedSub = ["dex", "naming", "test"];
   subs.sort().forEach((e, idx) => expect(e).toBe(expectedSub[idx]));
 });
+
+test("Create sub - Fee payer ", async () => {
+  const sub = "gvbhnjklmjnhb";
+  const parent = "bonfida.sol";
+  const feePayer = VAULT_OWNER;
+
+  const parentOwner = await resolve(connection, parent);
+  const [, ix] = await createSubdomain(
+    connection,
+    sub + "." + parent,
+    parentOwner,
+    1_000,
+    feePayer,
+  );
+  const tx = new Transaction();
+  tx.add(...ix);
+  const { blockhash } = await connection.getLatestBlockhash();
+
+  tx.recentBlockhash = blockhash;
+  tx.feePayer = VAULT_OWNER;
+  const res = await connection.simulateTransaction(tx);
+  expect(res.value.err).toBe(null);
+});