multer.js

const multer = require("multer");
const path = require("path");
const crypto = require("crypto");
const aws = require("aws-sdk");
const multerS3 = require("multer-s3");

const storageTypes = {
  local: multer.diskStorage({
    destination: (req, file, cb) => {
      cb(null, path.resolve(__dirname, "..", "..", "tmp", "uploads"));
    },
    filename: (req, file, cb) => {
      crypto.randomBytes(16, (err, hash) => {
        if (err) {
          cb(err);
        }
        file.key = `${hash.toString("hex")}-${file.originalname}`;
        cb(null, file.key);
      });
    },
  }),
  s3: multerS3({
    s3: new aws.S3({
      accessKeyId: process.env.AWS_ACCESS_KEY_ID,
      secretAccessKey: process.env.AWS_SECRET_ACESS_KEY,
    }),
    bucket: process.env.S3_BUCKET_NAME,
    contentType: multerS3.AUTO_CONTENT_TYPE,
    acl: "public-read",
    key: (req, file, cb) => {
      crypto.randomBytes(16, (err, hash) => {
        if (err) {
          cb(err);
        }
        file.key = `${hash.toString("hex")}-${file.originalname}`;
        cb(null, file.key);
      });
    },
  }),
};

module.exports = {
  dest: path.resolve(__dirname, "..", "..", "tmp", "uploads"),
  storage: storageTypes[process.env.STORAGE_TYPE],
  limits: {
    fileSize: 2 * 1024 * 1024,
  },
  fileFilter: (req, file, cb) => {
    const allowedMimes = ["image/jpeg", "image/jpg", "image/pjpg", "image/png"];
    if (allowedMimes.includes(file.mimetype)) {
      cb(null, true);
    } else {
      cb(new Error("Invalid file type"));
    }
  },
};