Multer：文件过滤器不工作

Question

我正在使用 multer 上传文件。一切正常，但 fileFilter 不工作。我不知道我哪里出错了。

routes.js

var multer = require('multer');
// Multer diskStorage setting
var storage = multer.diskStorage({
  destination: function (req, file, callback) {
    callback(null, './uploads/');
  },
  filFilter: function (req, file, cb) {
    var typeArray = file.mimetype.split('/');
    var fileType = typeArray[1];
    if (fileType == 'jpg' || fileType == 'png') {
      cb(null, true);
    } else {
      cb(null, false)
    }
  },
  filename: function (req, file, callback) {
    callback(null, file.fieldname + '_' + Date.now() + '.jpg');
  }
});

var upload = multer({ storage: storage });
router.post('/add', upload.single('photo'), function(req, res){

    console.log('uploaded');
}

Multer 还会上传不允许的文件。有什么想法吗？

Answer 1

您的文件过滤器有错字；您已将其命名为 filFilter。您能否将您的代码更改为以下内容并告诉我们它是否成功？

var multer = require('multer');
// Multer diskStorage setting
var storage = multer.diskStorage({
  destination: function (req, file, callback) {
    callback(null, './uploads/');
  },
  fileFilter: function (req, file, cb) {
    var typeArray = file.mimetype.split('/');
    var fileType = typeArray[1];
    if (fileType == 'jpg' || fileType == 'png') {
      cb(null, true);
    } else {
      cb(null, false)
    }
  },
  filename: function (req, file, callback) {
    callback(null, file.fieldname + '_' + Date.now() + '.jpg');
  }
});

var upload = multer({ storage: storage });
router.post('/add', upload.single('photo'), function(req, res){

    console.log('uploaded');
}

Answer 2

const storage = multer.diskStorage({
    destination: function (req, file, callback) {
        callback(null, './uploads/');
    },
    fileFilter: function (req, file, cb) {
        const extension = path.extname(file.originalname).toLowerCase();
        const mimetyp = file.mimetype;
        if (
            extension !== '.jpg' ||
            extension !== '.jpeg' ||
            extension !== '.png' ||
            mimetyp !== 'image/png' ||
            mimetyp !== 'image/jpg' ||
            mimetyp !== 'image/jpeg'
        ) {
            cb('error message', true);
        }
    },
    filename: function (req, file, callback) {
        callback(null, file.fieldname + '_' + Date.now() + '.jpg');
    },
});

const upload = multer({ storage: storage });
router.post('/add', upload.single('photo'), function (req, res) {
    console.log('uploaded');
});

我认为这会有所帮助

Answer 3

fileFilter 必须在 multer 的 options object 而不是 diskStorage

中定义

const uploadFilter = function(req, file, cb) {
    // filter rules here
}

const upload = multer({
    storage: storage,
    fileFilter: uploadFilter,
});

Multer：文件过滤器不工作

Multer: fileFilter not working

node.js

express

multer