el.xwx.moe/lib/api/generatePreview.ts

import Jimp from "jimp";
import { prisma } from "./db";
import createFile from "./storage/createFile";

const generatePreview = async (
  buffer: Buffer,
  collectionId: number,
  linkId: number
) => {
  if (buffer && collectionId && linkId) {
    // Load the image using Jimp
    await Jimp.read(buffer, async (err, image) => {
      if (image && !err) {
        image?.resize(1280, Jimp.AUTO).quality(20);
        const processedBuffer = await image?.getBufferAsync(Jimp.MIME_JPEG);

        if (
          Buffer.byteLength(processedBuffer) >
          1024 * 1024 * Number(process.env.PREVIEW_MAX_BUFFER || 0.1)
        )
          return console.log("Error generating preview: Buffer size exceeded");

        await createFile({
          data: processedBuffer,
          filePath: `archives/preview/${collectionId}/${linkId}.jpeg`,
        });

        await prisma.link.update({
          where: { id: linkId },
          data: {
            preview: `archives/preview/${collectionId}/${linkId}.jpeg`,
          },
        });
      }
    }).catch((err) => {
      console.error("Error processing the image:", err);
    });
  }
};

export default generatePreview;