自定义 Multer 存储 - 使用 Sharp 时的非法操作

Custom Multer storage - Illegal operation when using Sharp

我正在使用 Multer together with Sharp to store images uploaded as part of an HTML form. I want to resize and transform the images before storing them on the disk and found this 讨论如何做到这一点。

我以为我已经正确设置了所有内容,但是当我尝试上传图片时,我得到:

Error: EISDIR: illegal operation on a directory, open 'C:\...\uploads'

下面是我的代码:

Routes.js:

var multer = require('multer');
var customStorage = require(path.join(__dirname, 'customStorage.js'));

var upload = multer({
    storage: new customStorage({
        destination: function (req, file, cb) {
            cb(null, path.join(__dirname, 'uploads'));
        },
        filename: function (req, file, cb) {
            cb(null, Date.now());
        }
    }),
    limits: { fileSize: 5000000 }
});
...
app.use('/upload', upload.single('file'), (req, res) => { ... });

customStorage.js:

var fs = require('fs');
var sharp = require('sharp');

function getDestination (req, file, cb) {
    cb(null, '/dev/null'); // >Implying I use loonix
};

function customStorage (opts) {
    this.getDestination = (opts.destination || getDestination);
};

customStorage.prototype._handleFile = function _handleFile(req, file, cb) {
    this.getDestination(req, file, function (err, path) {
        if (err) return cb(err);

        var outStream = fs.createWriteStream(path);
        var transform = sharp().resize(200, 200).background('white').embed().jpeg();

        file.stream.pipe(transform).pipe(outStream);
        outStream.on('error', cb);
        outStream.on('finish', function () {
            cb(null, {
                path: path,
                size: outStream.bytesWritten
            });
        });
    });
};

customStorage.prototype._removeFile = function _removeFile(req, file, cb) {
    fs.unlink(file.path, cb);
};

module.exports = function (opts) {
    return new customStorage(opts);
};

错误错误:EISDIR:对目录的非法操作在此上下文中表示您将 Multer 的目标设置为一个目录,而它应该是目标文件的名称。

目的地设置在 Routes.jscb(null, path.join(__dirname, 'uploads')); 行中。如果将此行更改为 cb(null, path.join(__dirname, 'myDirectory\mySubdirectory\', myFilename + '.jpg')) 之类的内容,它将起作用。