서버 코드를 Router, Service, Repository 계층으로 분리하고 오류 처리 및 파일 삭제 로직 개선

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

src/lib/server/services/category.ts

@@ -0,0 +1,62 @@
+import { CategoryRepo, FileRepo } from "#lib/server/db/index.js";
+import type { Ciphertext } from "#lib/server/db/schema/index.js";
+import { AppError } from "#lib/server/errors.js";
+import { ensureFreshDekVersion } from "./common";
+
+export const getCategory = async (userId: number, categoryId: CategoryId, recurse: boolean) => {
+  const category =
+    categoryId !== "root" ? await CategoryRepo.getCategory(userId, categoryId) : undefined;
+  if (category === null) {
+    throw new AppError("NOT_FOUND", "Category not found");
+  }
+
+  const [subCategories, files] = await Promise.all([
+    CategoryRepo.getAllCategoriesByParent(userId, categoryId),
+    categoryId !== "root" ? FileRepo.getAllFilesByCategory(userId, categoryId, recurse) : undefined,
+  ]);
+  return { category, subCategories, files };
+};
+
+export const createCategory = async (params: CategoryRepo.NewCategory) => {
+  ensureFreshDekVersion(params.dekVersion);
+  await CategoryRepo.registerCategory(params);
+};
+
+export const renameCategory = async (
+  userId: number,
+  categoryId: number,
+  dekVersion: Date,
+  encName: Ciphertext,
+) => {
+  await CategoryRepo.setCategoryEncName(userId, categoryId, dekVersion, encName);
+};
+
+export const deleteCategory = async (userId: number, categoryId: number) => {
+  await CategoryRepo.unregisterCategory(userId, categoryId);
+};
+
+const ensureCategoryAndFileExist = async (userId: number, categoryId: number, fileId: number) => {
+  const [category, file] = await Promise.all([
+    CategoryRepo.getCategory(userId, categoryId),
+    FileRepo.getFile(userId, fileId),
+  ]);
+  if (!category) {
+    throw new AppError("NOT_FOUND", "Category not found");
+  } else if (!file) {
+    throw new AppError("NOT_FOUND", "File not found");
+  }
+};
+
+export const addFileToCategory = async (userId: number, categoryId: number, fileId: number) => {
+  await ensureCategoryAndFileExist(userId, categoryId, fileId);
+  await FileRepo.addFileToCategory(fileId, categoryId);
+};
+
+export const removeFileFromCategory = async (
+  userId: number,
+  categoryId: number,
+  fileId: number,
+) => {
+  await ensureCategoryAndFileExist(userId, categoryId, fileId);
+  await FileRepo.removeFileFromCategory(fileId, categoryId);
+};