mean-guide-backend/src/middleware/image.js

Backend for the mean stack guide course

const multer = require('multer')

const MIME_TYPE_MAP = {
  'image/png': 'png',
  'image/jpeg': 'jpg',
  'image/jpg': 'jpg',
}

const storage = multer.diskStorage({
  destination: (req, file, cb) => {
    const isValid = MIME_TYPE_MAP[file.mimetype]
    let error = new Error(`Invalid mime type ${file.mimetype}`)
    if (isValid) {
      error = null
    }
    cb(error, 'images')
  },
  filename: (req, file, cb) => {
    const name = file.originalname.toLowerCase().split(' ').join('-')
    const ext = MIME_TYPE_MAP[file.mimetype]
    cb(null, `${name}-${Date.now()}.${ext}`)
  },
})

module.exports = {
  imageProcess: multer({ storage }).single('image')
}