프론트엔드에서의 파일 업로드 전 중복 검사 구현

src/lib/server/db/file.ts

@@ -220,6 +220,23 @@ export const getAllFilesByParent = async (userId: number, parentId: DirectoryId)
     );
 };
 
+export const getAllFileIdsByContentHmac = async (
+  userId: number,
+  hskVersion: number,
+  contentHmac: string,
+) => {
+  return await db
+    .select({ id: file.id })
+    .from(file)
+    .where(
+      and(
+        eq(file.userId, userId),
+        eq(file.hskVersion, hskVersion),
+        eq(file.contentHmac, contentHmac),
+      ),
+    );
+};
+
 export const getFile = async (userId: number, fileId: number) => {
   const res = await db
     .select()

src/lib/server/schemas/file.ts

@@ -22,6 +22,17 @@ export const fileRenameRequest = z.object({
 });
 export type FileRenameRequest = z.infer<typeof fileRenameRequest>;
 
+export const duplicateFileScanRequest = z.object({
+  hskVersion: z.number().int().positive(),
+  contentHmac: z.string().base64().nonempty(),
+});
+export type DuplicateFileScanRequest = z.infer<typeof duplicateFileScanRequest>;
+
+export const duplicateFileScanResponse = z.object({
+  files: z.number().int().positive().array(),
+});
+export type DuplicateFileScanResponse = z.infer<typeof duplicateFileScanResponse>;
+
 export const fileUploadRequest = z.object({
   parentId: z.union([z.enum(["root"]), z.number().int().positive()]),
   mekVersion: z.number().int().positive(),

src/lib/server/services/file.ts

@@ -7,6 +7,7 @@ import { v4 as uuidv4 } from "uuid";
 import { IntegrityError } from "$lib/server/db/error";
 import {
   registerFile,
+  getAllFileIdsByContentHmac,
   getFile,
   setFileEncName,
   unregisterFile,
@@ -76,6 +77,15 @@ export const renameFile = async (
   }
 };
 
+export const scanDuplicateFiles = async (
+  userId: number,
+  hskVersion: number,
+  contentHmac: string,
+) => {
+  const fileIds = await getAllFileIdsByContentHmac(userId, hskVersion, contentHmac);
+  return { files: fileIds.map(({ id }) => id) };
+};
+
 const safeUnlink = async (path: string) => {
   await unlink(path).catch(console.error);
 };