সার্ভার সাইড ফাইল ভ্যালিডেশন

const multer = require('multer');
const upload = multer({
  storage: storage,
});

const multer = require('multer');
const upload = multer({
  storage: storage,
  limits:{
    fieldSize:1000000, // 1mb
  },
});

const multer = require('multer');
const upload = multer({
  storage: storage,
  fileFilter: (req, file, cb) => {
    // Only allow images
    const filetypes = /jpeg|jpg|png/;
    if (!filetypes.test(file.mimetype)) {
      cb(new Error('Only images are allowed'));
    } else {
      cb(null, true);
    }
  }
});

const express = require('express');
const app = express();

const multer = require('multer');
const upload = multer({
  storage: storage,
  limits: {
    fieldSize: 1000000, // 1mb
  },
  fileFilter: (req, file, cb) => {
    // Get the name of the input field
    const fieldName = file.fieldname;

    // Switch on the field name to apply the appropriate filter
    switch (fieldName) {
      case 'profile':
        // Only allow images
        if (!/jpeg|jpg|png/.test(file.mimetype)) {
          cb(new Error('Only images are allowed for profile'));
          return;
        }
        break;
      case 'nidpic':
        // Only allow PNG files
        if (!/png/.test(file.mimetype)) {
          cb(new Error('Only PNG files are allowed for nidpic'));
          return;
        }
        break;
      default:
        // Unknown field name
        cb(new Error('Unknown field name'));
        return;
    }

    // File is valid
    cb(null, true);
  },
});

app.post('/uploads', upload.fields([
  { name: 'profile', maxCount: 2 },
  { name: 'nidpic', maxCount: 1 }
]), (req, res) => {
  // File uploaded successfully
  res.send('File uploaded successfully');
});

app.listen(3000, () => {
  console.log('Server listening on port 3000');
});