Service Worker를 활용한 스트리밍 방식 파일 복호화 구현

src/lib/serviceWorker/client.ts

@@ -0,0 +1,39 @@
+import { DECRYPTED_FILE_URL_PREFIX } from "$lib/constants";
+import type { FileMetadata, ServiceWorkerMessage, ServiceWorkerResponse } from "./types";
+
+const PREPARE_TIMEOUT_MS = 5000;
+
+const getServiceWorker = async () => {
+  const registration = await navigator.serviceWorker.ready;
+  const sw = registration.active;
+  if (!sw) {
+    throw new Error("Service worker not activated");
+  }
+  return sw;
+};
+
+export const prepareFileDecryption = async (id: number, metadata: FileMetadata) => {
+  const sw = await getServiceWorker();
+  return new Promise<void>((resolve, reject) => {
+    const timeout = setTimeout(
+      () => reject(new Error("Service worker timeout")),
+      PREPARE_TIMEOUT_MS,
+    );
+    const handler = (event: MessageEvent<ServiceWorkerResponse>) => {
+      if (event.data.type === "decryption-ready" && event.data.fileId === id) {
+        clearTimeout(timeout);
+        navigator.serviceWorker.removeEventListener("message", handler);
+        resolve();
+      }
+    };
+    navigator.serviceWorker.addEventListener("message", handler);
+
+    sw.postMessage({
+      type: "decryption-prepare",
+      fileId: id,
+      ...metadata,
+    } satisfies ServiceWorkerMessage);
+  });
+};
+
+export const getDecryptedFileUrl = (id: number) => `${DECRYPTED_FILE_URL_PREFIX}${id}`;