/api/file/[id]/thumbnail, /api/file/[id]/thumbnail/download, /api/file/[id]/thumbnail/upload Endpoint 구현

src/lib/server/services/file.ts

@@ -16,6 +16,7 @@ import {
   getAllFileCategories,
   type NewFile,
 } from "$lib/server/db/file";
+import { getFileThumbnail, updateFileThumbnail } from "$lib/server/db/media";
 import type { Ciphertext } from "$lib/server/db/schema";
 import env from "$lib/server/loadenv";
 
@@ -85,6 +86,59 @@ export const renameFile = async (
   }
 };
 
+export const getFileThumbnailInformation = async (userId: number, fileId: number) => {
+  const thumbnail = await getFileThumbnail(userId, fileId);
+  if (!thumbnail) {
+    error(404, "File or its thumbnail not found");
+  }
+
+  return { encContentIv: thumbnail.encContentIv };
+};
+
+export const getFileThumbnailStream = async (userId: number, fileId: number) => {
+  const thumbnail = await getFileThumbnail(userId, fileId);
+  if (!thumbnail) {
+    error(404, "File or its thumbnail not found");
+  }
+
+  const { size } = await stat(thumbnail.path);
+  return {
+    encContentStream: Readable.toWeb(createReadStream(thumbnail.path)),
+    encContentSize: size,
+  };
+};
+
+export const uploadFileThumbnail = async (
+  userId: number,
+  fileId: number,
+  dekVersion: Date,
+  encContentIv: string,
+  encContentStream: Readable,
+) => {
+  const path = `${env.thumbnailsPath}/${userId}/${uuidv4()}`;
+  await mkdir(dirname(path), { recursive: true });
+
+  try {
+    await pipeline(encContentStream, createWriteStream(path, { flags: "wx", mode: 0o600 }));
+
+    const oldPath = await updateFileThumbnail(userId, fileId, dekVersion, path, encContentIv);
+    if (oldPath) {
+      safeUnlink(oldPath); // Intended
+    }
+  } catch (e) {
+    await safeUnlink(path);
+
+    if (e instanceof IntegrityError) {
+      if (e.message === "File not found") {
+        error(404, "File not found");
+      } else if (e.message === "Invalid DEK version") {
+        error(400, "Mismatched DEK version");
+      }
+    }
+    throw e;
+  }
+};
+
 export const scanDuplicateFiles = async (
   userId: number,
   hskVersion: number,