Build the EPUB Upload Endpoint

Task

Create an authenticated upload endpoint that accepts an EPUB file and creates the matching Book record.

Route

Create:

app/api/books/upload/route.ts

Read the multipart form:

const formData = await request.formData();
const file = formData.get("file");

if (!(file instanceof File)) {
  return Response.json({ error: "EPUB file is required" }, { status: 400 });
}

Convert it to a buffer for the storage client:

const body = Buffer.from(await file.arrayBuffer());

Generate an object key scoped to the current user:

const key = `users/${user.id}/books/${crypto.randomUUID()}.epub`;

Then upload:

await storage.send(
  new PutObjectCommand({
    Bucket: bucket,
    Key: key,
    Body: body,
    ContentType: "application/epub+zip",
  }),
);

Create the Book record only after the upload succeeds.

If database creation fails after the object is stored, delete the object as part of the failure cleanup.

Test

Upload a small EPUB through the prepared Library upload UI.

Confirm:

• an object appears in SeaweedFS
• a Book record appears in PostgreSQL
• the Book points to the correct storage key

Checkpoint

An authenticated Readly user can upload a real EPUB and create a persistent Book record.