From 0148128ef09d2a31be67aa549a77dc84c9d198bf Mon Sep 17 00:00:00 2001
From: ara <226676426+ara-stock@users.noreply.github.com>
Date: Fri, 9 Oct 2026 09:51:26 +0900
Subject: [PATCH] js: Use UTF-8 byte length for metadata string prefixes

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 clients/js-legacy/tests/transactions.test.ts | 36 ++++++++++++++++++++
 clients/js/src/instructions.ts               | 15 ++++----
 2 files changed, 45 insertions(+), 6 deletions(-)

diff --git a/clients/js-legacy/tests/transactions.test.ts b/clients/js-legacy/tests/transactions.test.ts
index 437309a5..a05ffa7f 100644
--- a/clients/js-legacy/tests/transactions.test.ts
+++ b/clients/js-legacy/tests/transactions.test.ts
@@ -432,6 +432,42 @@ test('update metadata', async (t) => {
   );
 });
 
+test('update metadata with non-ascii name', async (t) => {
+  const authorizedWithdrawer = new Keypair();
+
+  const context = await startWithContext(authorizedWithdrawer.publicKey);
+  const svm = context.svm;
+  const payer = context.payer;
+  const connection = new LiteConnection(svm, payer);
+
+  const voteAccountAddress = new PublicKey(voteAccount.pubkey);
+  const poolAddress = await findPoolAddress(SinglePoolProgram.programId, voteAccountAddress);
+  const poolMintAddress = await findPoolMintAddress(SinglePoolProgram.programId, poolAddress);
+  const poolMetadataAddress = findMplMetadataAddress(poolMintAddress);
+
+  let transaction = await SinglePoolProgram.initialize(
+    connection,
+    voteAccountAddress,
+    payer.publicKey,
+  );
+  await processTransaction(context, transaction);
+
+  const newName = 'Café Staking ☀';
+  const newSymbol = 'stkÉ';
+  transaction = await SinglePoolProgram.updateTokenMetadata(
+    voteAccountAddress,
+    authorizedWithdrawer.publicKey,
+    newName,
+    newSymbol,
+  );
+  await processTransaction(context, transaction, [authorizedWithdrawer]);
+
+  const metadataAccount = svm.getAccount(poolMetadataAddress);
+  const metadata = new TextDecoder().decode(metadataAccount.data);
+  t.true(metadata.indexOf(newName) > -1, 'metadata name has been updated');
+  t.true(metadata.indexOf(newSymbol) > -1, 'metadata symbol has been updated');
+});
+
 test('get vote account address', async (t) => {
   const context = await startWithContext();
   const svm = context.svm;
diff --git a/clients/js/src/instructions.ts b/clients/js/src/instructions.ts
index 7b81349d..f88b48a0 100644
--- a/clients/js/src/instructions.ts
+++ b/clients/js/src/instructions.ts
@@ -407,14 +407,17 @@ export async function updateTokenMetadataInstruction(
   const mplMetadata = await findMplMetadataAddress(mint);
 
   const text = new TextEncoder();
+  const nameBytes = text.encode(tokenName);
+  const symbolBytes = text.encode(tokenSymbol);
+  const uriBytes = text.encode(tokenUri);
   const data = new Uint8Array([
     SinglePoolInstructionType.UpdateTokenMetadata,
-    ...getU32Encoder().encode(tokenName.length),
-    ...text.encode(tokenName),
-    ...getU32Encoder().encode(tokenSymbol.length),
-    ...text.encode(tokenSymbol),
-    ...getU32Encoder().encode(tokenUri.length),
-    ...text.encode(tokenUri),
+    ...getU32Encoder().encode(nameBytes.length),
+    ...nameBytes,
+    ...getU32Encoder().encode(symbolBytes.length),
+    ...symbolBytes,
+    ...getU32Encoder().encode(uriBytes.length),
+    ...uriBytes,
   ]);
 
   return {