형식이 잘못된 세션 쿠키로 인해 서버 오류가 발생하던 문제와 업로드 중 오류가 무시되거나 무한히 대기하던 문제 등 버그 수정

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/workers/hmac.ts

@@ -6,20 +6,25 @@ export interface ComputeMessage {
   key: Uint8Array;
 }
 
-export interface ResultMessage {
-  result: Uint8Array;
-}
+// Errors are sent as messages, as rejections in `onmessage` don't fire `error` on the worker
+export type ResultMessage = { result: Uint8Array } | { error: Error };
 
 self.onmessage = async (event: MessageEvent<ComputeMessage>) => {
-  const h = hmac.create(sha256, event.data.key);
-  const reader = event.data.stream.getReader();
+  try {
+    const h = hmac.create(sha256, event.data.key);
+    const reader = event.data.stream.getReader();
 
-  while (true) {
-    const { done, value } = await reader.read();
-    if (done) break;
-    h.update(value);
+    while (true) {
+      const { done, value } = await reader.read();
+      if (done) break;
+      h.update(value);
+    }
+
+    const result = h.digest();
+    self.postMessage({ result } satisfies ResultMessage, { transfer: [result.buffer] });
+  } catch (e) {
+    // Only errors are guaranteed to be cloneable
+    const error = e instanceof Error ? e : new Error(String(e));
+    self.postMessage({ error } satisfies ResultMessage);
   }
-
-  const result = h.digest();
-  self.postMessage({ result } satisfies ResultMessage, { transfer: [result.buffer] });
 };