upload image

action.ts

"use server";

import { writeFile } from "fs/promises";
import path from "path";

export const uploadImage = async (data: FormData): Promise<string> => {
  const image = data.get("image") as File | null;

  if (!image) {
    throw new Error("Image no found");
  }

  const allowedMimeTypes = ["image/jpeg", "image/png", "image/webp"];
  if (!allowedMimeTypes.includes(image.type)) {
    throw new Error("Invalid image type");
  }

  const allowedExtensions = [".jpg", ".jpeg", ".png", ".webp"];
  const extension = path.extname(image.name).toLowerCase();
  if (!allowedExtensions.includes(extension)) {
    throw new Error("Invalid file extension");
  }

  const safeFileName = generateToken(16) + extension;

  const bytes = await image.arrayBuffer();
  const buffer = Buffer.from(bytes);

  const uploadDir = path.join(process.cwd(), "public", "upload");
  const filePath = path.join(uploadDir, safeFileName);
  await writeFile(filePath, buffer);
  return safeFileName;
};