파일 다운로드 임시 구현

src/routes/(fullscreen)/file/[id]/service.ts

@@ -0,0 +1,33 @@
+import { decryptData } from "$lib/modules/crypto";
+
+export { decryptFileMetadata } from "$lib/services/file";
+
+export const requestFileDownload = (
+  fileId: number,
+  fileEncryptedIv: string,
+  dataKey: CryptoKey,
+) => {
+  return new Promise<ArrayBuffer>((resolve, reject) => {
+    const xhr = new XMLHttpRequest();
+    xhr.responseType = "arraybuffer";
+
+    xhr.addEventListener("load", async () => {
+      if (xhr.status !== 200) {
+        reject(new Error("Failed to download file"));
+        return;
+      }
+
+      const fileDecrypted = await decryptData(
+        xhr.response as ArrayBuffer,
+        fileEncryptedIv,
+        dataKey,
+      );
+      resolve(fileDecrypted);
+    });
+
+    // TODO: Progress, ...
+
+    xhr.open("GET", `/api/file/${fileId}/download`);
+    xhr.send();
+  });
+};