썸네일 설정 페이지 완성

src/lib/modules/file/upload.ts

@@ -94,7 +94,6 @@ const generateThumbnail = async (file: File, fileType: string) => {
     }
     return null;
   } catch {
-    // TODO: Error handling
     return null;
   } finally {
     if (url) {

src/lib/services/file.ts

@@ -1,9 +1,22 @@
 import { callGetApi } from "$lib/hooks";
 import { decryptData } from "$lib/modules/crypto";
-import { storeFileThumbnail } from "$lib/modules/file";
+import { getFileCache, storeFileCache, downloadFile, storeFileThumbnail } from "$lib/modules/file";
 import { getThumbnailUrl } from "$lib/modules/thumbnail";
 import type { FileThumbnailInfoResponse } from "$lib/server/schemas";
 
+export const requestFileDownload = async (
+  fileId: number,
+  fileEncryptedIv: string,
+  dataKey: CryptoKey,
+) => {
+  const cache = await getFileCache(fileId);
+  if (cache) return cache;
+
+  const fileBuffer = await downloadFile(fileId, fileEncryptedIv, dataKey);
+  storeFileCache(fileId, fileBuffer); // Intended
+  return fileBuffer;
+};
+
 export const requestFileThumbnailDownload = async (fileId: number, dataKey: CryptoKey) => {
   let res = await callGetApi(`/api/file/${fileId}/thumbnail`);
   if (!res.ok) return null;