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/db/repositories/media.ts

@@ -0,0 +1,86 @@
+import type { NotNull } from "kysely";
+import { IntegrityError } from "../error";
+import db from "../kysely";
+import { enqueueFileDeletions } from "./fileDeletion";
+
+interface Thumbnail {
+  id: number;
+  path: string;
+  updatedAt: Date;
+  encContentIv: string | null;
+}
+
+interface FileThumbnail extends Thumbnail {
+  fileId: number;
+}
+
+export const updateFileThumbnail = async (
+  trx: typeof db,
+  userId: number,
+  fileId: number,
+  dekVersion: Date,
+  path: string,
+  encContentIv: string | null,
+) => {
+  const file = await trx
+    .selectFrom("file")
+    .select("data_encryption_key_version")
+    .where("id", "=", fileId)
+    .where("user_id", "=", userId)
+    .limit(1)
+    .forUpdate()
+    .executeTakeFirst();
+  if (!file) {
+    throw new IntegrityError("File not found");
+  } else if (file.data_encryption_key_version.getTime() !== dekVersion.getTime()) {
+    throw new IntegrityError("Invalid DEK version");
+  }
+
+  const thumbnail = await trx
+    .selectFrom("thumbnail")
+    .select("path as oldPath")
+    .where("file_id", "=", fileId)
+    .limit(1)
+    .forUpdate()
+    .executeTakeFirst();
+  const now = new Date();
+
+  await trx
+    .insertInto("thumbnail")
+    .values({
+      file_id: fileId,
+      path,
+      updated_at: now,
+      encrypted_content_iv: encContentIv,
+    })
+    .onConflict((oc) =>
+      oc.column("file_id").doUpdateSet({
+        path,
+        updated_at: now,
+        encrypted_content_iv: encContentIv,
+      }),
+    )
+    .execute();
+  await enqueueFileDeletions(trx, [thumbnail?.oldPath]);
+};
+
+export const getFileThumbnail = async (userId: number, fileId: number) => {
+  const thumbnail = await db
+    .selectFrom("thumbnail")
+    .innerJoin("file", "thumbnail.file_id", "file.id")
+    .selectAll("thumbnail")
+    .where("file.id", "=", fileId)
+    .where("file.user_id", "=", userId)
+    .$narrowType<{ file_id: NotNull }>()
+    .limit(1)
+    .executeTakeFirst();
+  return thumbnail
+    ? ({
+        id: thumbnail.id,
+        fileId: thumbnail.file_id,
+        path: thumbnail.path,
+        encContentIv: thumbnail.encrypted_content_iv,
+        updatedAt: thumbnail.updated_at,
+      } satisfies FileThumbnail)
+    : null;
+};