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

src/lib/server/db/media.ts

@@ -0,0 +1,86 @@
+import type { NotNull } from "kysely";
+import { IntegrityError } from "./error";
+import db from "./kysely";
+
+interface Thumbnail {
+  id: number;
+  path: string;
+  createdAt: Date;
+  encContentIv: string;
+}
+
+interface FileThumbnail extends Thumbnail {
+  fileId: number;
+}
+
+export const updateFileThumbnail = async (
+  userId: number,
+  fileId: number,
+  dekVersion: Date,
+  path: string,
+  encContentIv: string,
+) => {
+  return await db.transaction().execute(async (trx) => {
+    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 old_path")
+      .where("file_id", "=", fileId)
+      .limit(1)
+      .forUpdate()
+      .executeTakeFirst();
+    const now = new Date();
+
+    await trx
+      .insertInto("thumbnail")
+      .values({
+        file_id: fileId,
+        path,
+        created_at: now,
+        encrypted_content_iv: encContentIv,
+      })
+      .onConflict((oc) =>
+        oc.column("file_id").doUpdateSet({
+          path,
+          created_at: now,
+          encrypted_content_iv: encContentIv,
+        }),
+      )
+      .execute();
+    return thumbnail?.old_path;
+  });
+};
+
+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,
+        createdAt: thumbnail.created_at,
+      } satisfies FileThumbnail)
+    : null;
+};