파일/디렉터리 목록 캐싱 추가

src/lib/modules/file.ts

@@ -0,0 +1,90 @@
+import { writable } from "svelte/store";
+import { callGetApi } from "$lib/hooks";
+import { unwrapDataKey, decryptString } from "$lib/modules/crypto";
+import type { DirectoryInfoResponse, FileInfoResponse } from "$lib/server/schemas";
+import {
+  directoryInfoStore,
+  fileInfoStore,
+  type DirectoryInfo,
+  type FileInfo,
+} from "$lib/stores/file";
+
+const fetchDirectoryInfo = async (directoryId: "root" | number, masterKey: CryptoKey) => {
+  const res = await callGetApi(`/api/directory/${directoryId}`);
+  if (!res.ok) throw new Error("Failed to fetch directory information");
+  const { metadata, subDirectories, files }: DirectoryInfoResponse = await res.json();
+
+  let newInfo: DirectoryInfo;
+  if (directoryId === "root") {
+    newInfo = {
+      id: "root",
+      subDirectoryIds: subDirectories,
+      fileIds: files,
+    };
+  } else {
+    const { dataKey } = await unwrapDataKey(metadata!.dek, masterKey);
+    newInfo = {
+      id: directoryId,
+      dataKey,
+      dataKeyVersion: metadata!.dekVersion,
+      name: await decryptString(metadata!.name, metadata!.nameIv, dataKey),
+      subDirectoryIds: subDirectories,
+      fileIds: files,
+    };
+  }
+
+  const info = directoryInfoStore.get(directoryId);
+  if (info) {
+    info.update(() => newInfo);
+  } else {
+    directoryInfoStore.set(directoryId, writable(newInfo));
+  }
+};
+
+export const getDirectoryInfo = (directoryId: "root" | number, masterKey: CryptoKey) => {
+  // TODO: MEK rotation
+
+  let info = directoryInfoStore.get(directoryId);
+  if (!info) {
+    info = writable(null);
+    directoryInfoStore.set(directoryId, info);
+  }
+
+  fetchDirectoryInfo(directoryId, masterKey);
+  return info;
+};
+
+const fetchFileInfo = async (fileId: number, masterKey: CryptoKey) => {
+  const res = await callGetApi(`/api/file/${fileId}`);
+  if (!res.ok) throw new Error("Failed to fetch file information");
+  const metadata: FileInfoResponse = await res.json();
+
+  const { dataKey } = await unwrapDataKey(metadata.dek, masterKey);
+  const newInfo: FileInfo = {
+    id: fileId,
+    dataKey,
+    dataKeyVersion: metadata.dekVersion,
+    contentIv: metadata.contentIv,
+    name: await decryptString(metadata.name, metadata.nameIv, dataKey),
+  };
+
+  const info = fileInfoStore.get(fileId);
+  if (info) {
+    info.update(() => newInfo);
+  } else {
+    fileInfoStore.set(fileId, writable(newInfo));
+  }
+};
+
+export const getFileInfo = (fileId: number, masterKey: CryptoKey) => {
+  // TODO: MEK rotation
+
+  let info = fileInfoStore.get(fileId);
+  if (!info) {
+    info = writable(null);
+    fileInfoStore.set(fileId, info);
+  }
+
+  fetchFileInfo(fileId, masterKey);
+  return info;
+};